| Title | Edition | Year of Publication | Contributors | Country of Publication | Possible Copyright Status | Available Online? |
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| Operative surgery for students and practitioners | 4th rev. and enl. ed. | 1913 | John Joseph McGrath | |  | |  | |
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| Operative surgery for thirdy year, L. I. C H | | 1923 | Thomas Matthew Brennan | | | | | |
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| Operative surgery of the nose, throat, and ear, for laryngologists, rhinologists, otologists, and surgeons | | 1918 | Hanau AY. Loeb |  | | | | |
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| Operative surgery of the nose, throat, and ear: for laryngologists, rhinologists, otologists, and surgeons | | 1914 | Hanau Wolf Loeb, Joseph C. (Joseph Clar) Beck | | | | | | 
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| Operative surgery. t v. 3] The ear, air passages and neck. By Dr. Martin Kirschner ... with the collaboration of A. Laiitenschlager ... and Dr. O. Kleinschmidt ... Authorized translation by I. S. Ravdin ... and George M. Coates ... With 4(H) illustrations, mostly colored. Philadelphia and London, J. B. Lippincott company r c 1937] | | 1937 | | | | | | |
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| Operative surgery | | 1924 | (John Shelton) J. Shelton Horsley, Miss Helen Lorraine | | | |  | |
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| Operative surgery | | 1937 | Isaac A. (Isaac Alexander) Bigger, Claude C. Coleman, (John Shelton) J. Shelton Horsley | | | | | |   
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| Operative technics: a convenient reference and manual for practitioners and students of dentistry | 2d ed., illustrated with 299 engravings. | 1921 | William H. O. (William Harper Owen) McGehee | | | | |  |
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| The operator approach to problems of stability and convergence of solutions of difference equations and the convergence of various iteration procedures | | 1957 | Arnold Noah Lowan | | | | | |
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| The operator formalism in quantum perturbation theory / by Bryce S. Dewitt. | | 1955 | | | | | | |
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| Operator methods in electromagnetic field theory / by A.D. Bresler adn N. Marcuvitz. | | 1957 | | | | | | |
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| Operator no. 19. | | 1937 | | | | | | |
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| Operator's and Organizational Maintenance Manual for Teletypewriter Sets AN/FGC-25, AN/FGC-25X, AN/FGC-26, AN/FGC-26X, AN/FGC-52, AN/FGC-52X, AN/FGC-57, AN/FGC-68, AN/FGC-161, AN/FGC-162, AN/UGC-30 and AN/UGC-30X | | 9999 | United States. Department of the Army, United States. Department of the Air Force | | | | | |
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| Operator's manual for RUBY / Howard B. Levine [and] Robert E. Sharples. | | 1962 | | | | | | |
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| Operator techniques in atomic spectroscopy | | 1963 | Brian R. Judd | | | | | |
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| Operazioni militari sul fronte italiano nel 1918 | | 1930 | Paolo De Vecchi, Edgar Erskine Hume | | | | | |
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| The operculate Discomycetes of western Washington | | 1938 | Leon C. (Leon Carleton) Snyder | | | | | |
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| The operculate land mollusks of the family Annulariidae of the island of Hispaniola and the Bahama Archipelago | | 1946 | Paul Bartsch | | | | | |
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| Opere giuridiche e storiche del prof. Ilario Alibrandi | | 1896 | Ilario Alibrandi | | | | | |
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| Opere sul fascismo possedute dalla Biblioteca della Camera dei deputati al 30 guigno 1930-anno VIII. | | 1930 | |  | | | | |
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| Opern-uebersetzuna'en. [Berlin, Jungdentseher verlag, K. Fliegel & co., c 1911] | | 1911 | | | | | | |
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| Opernführer | | 1931 | Walter Heichen, Ferdinand von Strantz |  | | | | |
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| Opernführer: oper, operette, ballett, schauspielmusik. Mit 17 kunstdruck-tafeln | | 1935 | Wolfgang Retslag, Johannes Scholtze | | | | | |
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| Opernführer | | 1935 | Ferdinand von Strantz, Walter Abendroth | | | | | |
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| Operotaria urológica | | 1925 | |  | | | | |
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| Opfer | | 1921 | Hermann Sudermann | | | | | |
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| Opfergang: Vor der Entscheidung | | 1931 | Fritz von Unruh | | | | | |
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| Opfinderen: en historie om svaghed og styrke | | 1928 | Marius Dahlsgaard |  | | | | |
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| Ophiel | | 1911 | Talli J. Bouknight | | | | | |
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| Ophiuroidea of the Hawaiian Islands | | 1949 | Austin Hobart Clark | | | | | |
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| Ophtalmologie | | 1925 | Leopold Bussy | | | | | |
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| Ophtalmologie & otologie dans la pratique médicale | | 1922 | C. Sicur, Albert Poulard, Paul Bailliart |  | | | | |
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| Ophtalmologie vétérinaire et comparée | | 1928 | Eugène Nicolas | | | | | |
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| Ophthalmic dispensing. | | 1960 | | | | | | |
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| The ophthalmic formulary | | 1942 | George Griffin Lewis | | | | | |
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| Ophthalmic jurisprudence: a reprint from the American encyclopedia of ophthalmology, where the title is "Legal relations of ophthalmology," | | 1916 | Thomas Hall Shastid | | | | | |
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| Ophthalmic lenses | | 1932 | H. H. (Harold Heaton) Emsley, William Swaine | | | | | |
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| Ophthalmic lenses and accessories: lenses, frames, magnifiers and readers | | 1916 | | | | | | |
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| Ophthalmic lenses; their history, theory, and application | | 1935 | | | | | | |
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| Ophthalmic myology: a systematic treatise on the ocular muscles | 2nd ed. | 1911 | G. C. (Giles Christopher) Savage | | | | | |
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| The ophthalmic nurse | | 1920 | George Griffin Lewis | | | | | |
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| Ophthalmic operations. | | 1961 | | | | | | |
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| Ophthalmic pathology: an atlas and textbook | 2d ed. | 1962 | Michael John Hogan, L. E. (Lorenz E.) Zimmerman | | | | | |
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| Ophthalmic plastic surgery | | 1952 | Sidney Albert Fox | | | | | |
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| Ophthalmic reference book. | | 1948 | | | | | | |
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| Ophthalmic semiology and diagnosis | | 1913 | W. L. Pyle, Charles Heady Beard | | | | | |
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| Ophthalmic surgery: a handbook of the surgical operations on the eyeball and its appendages as practised at the clinic of Hofrat Prof | 2d ed. | 1912 | William Merrick Sweet, Josef Meller | | | | | |
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| Ophthalmic surgery: a treatise on surgical operations pertaining to the eye and its appendages | 2d ed. | 1914 | Charles Heady Beard | | | | | |
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| Ophthalmic surgery: handbook of the surgical operations on the eyeball and its appendages as practised at the I. eye clinic, University of Vienna | | 1923 | Josef Meller, Dr. Josef Meller, William Merrick Sweet | | | | | |
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| The ophthalmic year book. v. 10; containing a digest of the literature of ophthalmology for the year 1913. Ed | | 1914 | | | | | | |
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| The ophthalmic year book, v. 8 ; containing a digest of the literature of ophthalmology with index of publications for the year 1910 | | 1911 | Edward Jackson | | | | | |
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| Ophthalmology and otolaryngology | | 1957 | John Boyd Coates | | | | | |
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| Ophthalmology for veterinarians | | 1913 | Walter Nevin Sharp | | | | | |
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| Ophthalmology; notes for students | | 1930 | Cecil Starling O'Brien | | | | | |
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| Ophthalmometry: a practical text-book for the practitioner and advanced student in optometry | | 1925 | Elmer Le Roy Ryer | | | | | |
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| Ophthalmometry / by E. LeRoy Ryer and Elmer E. Hotaling ; foreward by A. T. Brombach. | | 1945 | | | | | | |
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| Ophthalmoscopic diagnosis based on typical pictures of the fundus of the eye: with special reference to the needs of general practitioners and students | | 1913 | Curt. Adam, Matthias Lanckton Foster | | | | | |
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| Ophthalmoscopic diagnosis, for general practitioners and students | | 1915 | George William Jean | | | | | |
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| Ophthalmoscopy, retinoscopy and refraction | | 1922 | William Albert Fisher | | | | | |
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| Ophthalmoscopy, retinoscopy and refraction | 2d rev. and enl. ed., | 1927 | William Albert Fisher | | | | | |
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| Ophthalmoskopische diagnostik an der hand typischer augenhintergrundsbilder | | 1912 | Curt. Adam | | | | | |
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| Opiate addiction; its handling and treatment | | 1922 | Edward Huntington Williams | | | | | |
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| Opiate addiction; psychological and neurophysiological aspects in relation to clinical problems | | 1953 | Abraham Wikler | | | | | |
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| Opie Read on golf | | 1925 | Opie Percival Read | | | | | |
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| Opie-ates: a collection of short stories | | 1926 | Adolf Oppenheimer | | | | | |
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| Opinion conflict and school support | | 1941 | Frederick Thornton Rope | | | | | |
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| Opinion leaders in American communities. Foreword by Max F. Millikan. | | 1959 | | | | | | |
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| Opinion regarding the rights of Hungary and of certain Hungarian nationals under the treaty of Trianon | | 1928 | George W. (George Woodward) Wickersham | | | | | |
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| The opinion shop | | 1913 | Hildric Davenport Owsley | | | | | |
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| Opinion survey on banking, December, 1939. | | 1939 | | | | | | |
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| Opinions and argument from speeches and addresses of the Earl of Balfour ... 1910-1927 | | 1928 | Earl of Arthur James Balfour Balfour | | | | | |
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| Opinions and arguments from speeches and addresses of the Earl of Balfour | | 1927 | Earl of Arthur James Balfour Balfour | | | | | |
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| Opinions and attitudes in the twentieth century | | 1934 | Stewart S. Morgan, William Thomas | | | | | |
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| Opinions and knowledge about high schools: in relation to social class and school-community policy | | 1962 | Daniel R. McLaughlin | | | | | |
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| Opinions and philosophies of Farmer John | | 1924 | John C. Ellis | | | | | |
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| The opinions and reflections of Napoleon, edited by Lewis Claflin Breed ... Boston, The Four seas company t c 1926] | | 1926 | | | | | | |
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| Opinions d'un homme de couleurs | | 1930 | Georges Lefranc, Émile. Lefranc | | | | | |
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| Opinions, literary and otherwise | | 1934 | Henry W. (Henry Waters) Taft | | | | | |
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| Opinions musicales: avec une réproduction du buste de Gabriel Fauré par son fils, Emmanuel Fauré-Fremiet | | 1930 | Pierre Barthélemy Gheusi, Gabriel Fauré | | | | | |
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| Opinions & nonsense | | 1926 | Rose E. Miller | | | | | |
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| Opinions of a cheerful Yankee | | 1926 | Irving Bacheller | | | | | |
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| The opinions of Anatole France | | 1922 | Paul Gsell, Anatole France | | | | | |
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| The opinions of John Abthorne on the arts and living. | | 1920 | John Abthorne | | | | | |
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| The opinions of John Clearfield | | 1921 | Lynn Harold Hough | | | | | |
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| Opinions of Michigan high school faculties concerning cooperative occupational education; a research project, with the cooperation of the Dept. of Vocational Education and Practical Arts, the University of Michigan and the Extension Service. | | 1960 | | | | | | |
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| Opinions of Orville A. Park, counsel of the Georgia bankers' association, 1913-1914. no. 3. Macon, Ga., The J. W. Burke co., 1914. | | 1914 | | | | | | |
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| Opinions of the attorney-general of Tennessee, from Oct. 1, 1930, to Sept. 30, 1931. L. D. Smith, attorney-general and | | 1932 | | | | | | |
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| Opinions of the attorneys general: decisions of the Interstate commerce commission, and of the United States Supreme court, which have been overruled, etc.; together with sections of the Revised statutes repealed, superseded or obsolete | | 1915 | John C. Brooke | | | | | |
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| Opinions on economic problems: a book of selected readings | | 1927 | Ralph Theodore Compton | | | | | |
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| Opinions sur le roman | | 1929 | René Boylesve | | | | | |
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| Opisanīe Korei | | 1900 | Anna Walther | | | | | |
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| Opisanīe rukopiseĭ Pochaevskoĭ Lavry, khraníàshchikhsíà v Biblīotekíè Muzeíà pri Kīevskoĭ dukhovnoĭ akademīi | | 1881 | Vasilīĭ. Berezin |  | | | | |
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| The opium alkaloids: selected topics | | 1962 | David Ginsburg | | | | | |
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| Opium as an international problem: the Geneva conferences | | 1925 | Westel Woodbury Willoughby | | | | | |
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| The opium monopoly | | 1920 | Ellen Newbold La Motte | | | | | |
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| The opium problem | | 1928 | Charles Edward Terry, Mildred Pellens | | | | | |
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| The opium problem | | 1925 | Charles E. Terry, Mildred Pellens | | | | | |
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| Opium: the demon flower | | 1926 | Sara Graham Mulhall | | | | | |
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| Opium: the demon flower | | 1926 | Sara Graham Mulhall | | | | | |
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| Opium: the diary of an addict | | 1932 | Ernest Augustus Boyd, Jean Cocteau | | | | | |
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| Opklaringen af Nostradamus profetier, ved direkt0r, | | 1920 | | | | | | |
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| Oplevelser og erindringer fra 1830-aarene og utover | 2. oplag. | 1912 | Olavus Arvesen |  | | | | |
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| Oplevelser og humoresker. Kristiania, H. Aschehoug & co. ( W. Nygaard) 1912. | | 1912 | | | | | | |
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| Opmerkingen betreffende het beleid van de mandaatsregeering van Palestina, met betrekking tot de arabische overvallen op de joodsche bevolking in augustus 1929, en betreffende de joodsche en de arabische volksgroepen | | 1930 | J. H. (Jacobus Henricus) Kann | | | | | |
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| Opothérapie clinique organothérapie: Formulaire | | 1925 | Marcel Laemmer | | | | | |
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| Opothérapie endocrinienne: les bases physiologiques, les syndromes, la posologie de l'opothérapie par les glandes à sécrétions internes | | 1925 | Guy Laroche | | | | | |
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| Opothérapie endocrinienne: les bases physiologiques, les syndromes, la posologie de l'opothérapie | | 1933 | Guy Laroche | | | | | |
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| Oppenheimer, Carl. | | 1913 | | | | | | |
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| The Oppermanns | | 1934 | Lion Feuchtwanger | | | | | |
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| The Oppermanns: a novel | | 1934 | Lion Feuchtwanger, James Cleugh | | | | | |
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| Oppi Aasmarka: fortælling | | 1913 | Adolf Skramstad | | | | | |
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| Opportunities for advanced study of music in the United States: a classified index of courses in music offered by universities, colleges, music schools, and conservatories in the academic year 1941-1942. Oportunidades para el estudio avanzado de la musica en los Estados Unidos; guía de los cursos de música ofrecidos por las universidades, colegios, escuelas de música y conservatorios durante el año académico de 1941-1942. Facilidades para a instrucão musical superior nos Estados Unidos; índice classificado dos cursos de música em universidades, escolas e conservatórios de música no ano acadêmico de 1941-1942 | | 1943 | Catharine Brooks Yale | | | | | |
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| Opportunities for graduate study in the British Isles | | 1929 | George Edwin MacLean | | | | | |
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| Opportunities for higher education in New York State ... a manual for the use of educational counselors, by Philip A. Cowen .... | | 1945 | | | | | | |
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| Opportunities for study at American graduate schools | | 1921 | Samuel Paul Capen, George Frederick Zook | | | | | |
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| Opportunities for the continuation of education in the armed forces | | 1951 | Werrett Wallace Charters | | | | | |
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| Opportunities for the medical education of Negroes | | 1936 | Gertrude E. Sturges, Dr. Walter L. Niles, Walter White | | | | | |
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| Opportunities for the preparation of teachers of exceptional children [prepared under the direction and supervision of Elise H.Martens with the assistance of Philip G.Rettig. | | 1949 | | | | | | |
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| Opportunities for vocational training in New York city, compiled by the Vocational service for juniors, Mary H. S. Hayes, director. New York city, The Vocational service for juniors, 1925. | | 1925 | | | | | | |
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| Opportunities for women in domestic science | | 1916 | Marie Francke, Susan M. (Susan Myra) Kingsbury | | | | | |
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| Opportunities for women in the municipal civil service of the city of New York: a study of the number of women employed, duties, qualifications | | 1918 | Mrs. Anna Martin Crocker, Fannie M. Witherspoon | | | | | |
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| Opportunities for work in a machine age | | 1933 | Fred Colfax Smith | | | | | |
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| Opportunities: how to make the most of them | Authorized ed. | 1916 | L. Charley, L. O, Lorenzo O'Rourke | | | | | |
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| Opportunities in acting: stage, screen, radio, television | | 1946 | Frank Vreeland | | | | | |
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| Opportunities in advertising | | 1950 | Ruth Hooper Larison | | | | | |
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| Opportunities in aviation | | 1920 | Arthur Sweetser, Gordon Lamont | | | | | |
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| Opportunities in aviation | | 1929 | Walter Hinton | | | | | |
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| Opportunities in aviation | | 1949 | 1912 Seth Babits | | | | | |
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| Opportunities in chemical engineering | | 1957 | Raphael Katzen | | | | | |
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| Opportunities in chemistry | | 1919 | Ellwood Hendrick | | | | | |
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| Opportunities in city planning | | 1961 | Marjorie Sue Berger | | | | | |
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| Opportunities in engineering | | 1920 | Charles M. (Charles Marcus) Horton | | | | | |
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| Opportunities in farming | | 1919 | Edward Owen. Dean | | | | | |
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| Opportunities in farming | | 1941 | Paul W. (Paul Wilber) Chapman | | | | | |
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| Opportunities in fashion ... | | 1946 | | | | | | |
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| Opportunities in finance | | 1951 | Sam Shulsky | | | | | |
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| Opportunities in forestry | | 1961 | E. L. (Elwood Leonard) Demmon | | | | | |
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| Opportunities in free-lance writing, by Hazel Carter Maxon. | | 1946 | | | | | | |
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| Opportunities in home economics: an annotated bibliography on home economics careers | | 1948 | Charlotte Elizabeth Biester | | | | | |
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| Opportunities in interior design and decoration: With the help of Mary E. Shipley | [1st ed.] | 1963 | Victoria Kloss Ball | | | | | |
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| Opportunities in merchant ships | | 1919 | Nelson Collins | | | | | |
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| Opportunities in plastics | | 1953 | Denis Arthur Dearle | | | | | |
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| Opportunities in psychology | | 1955 | Donald E. (Donald Edwin) Super | | | | | |
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| Opportunities in school and industry for children of the stockyards district | | 1912 | Ernest L. (Ernest Lynn). Talbert | | | | | |
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| Opportunities in social work. | | 1957 | | | | | | |
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| Opportunities in the armed forces | | 1942 | Maxwell Lehman, Morton Yarmon | | | | | |
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| Opportunities in the civil service | | 1917 | Leonhard Felix Fuld | | | | | |
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| Opportunities in the newspaper business | | 1919 | James Melvin Lee | | | | | |
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| Opportunities of the life underwriter in the light of recent events: with principal emphasis upon partnership and close corporation insurance | | 1934 | Dr. S. S. Huebner, Solomon S. Huebner | | | | | |
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| Opportunities of today for boys and girls | | 1921 | Bennett Barron Jackson, Norma Helen Deming, Dr. Charles A. Prosser | | | | | |
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| Opportunities out-of-doors | | 1921 | Edward Owen. Dean | | | | | |
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| Opportunities through mental health project grants: a program of the National Institute of Mental Health | | 1959 | | | | | | |
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| Opportunities to share | | 1945 | Andrew Charles Chapman | | | | | |
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| Opportunity | | 1925 | Andrew Wheatley Edson, Beulah Mitchell Clute, Mary Elizabeth Laing | | | | | |
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| Opportunity 2000: creative affirmative action strategies for a changing workforce | | 1988 | Hudson Institute | | | | | |
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| Opportunity ahead! | | 1929 | F. Green, Clayton H. (Clayton Holt) Ernst, P. Adams | | | | | |
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| Opportunity and accomplishment in secondary education | | 1926 | Paul H. (Paul Henry) Hanus | | | | | |
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| Opportunity and Theodore Roosevelt | | 1924 | Warrington Dawson | | | | | |
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| An opportunity for an industrial museum in New York; a preliminary announcement by the New York Museum of science and industry. [New York] 1932. | | 1932 | | | | | | |
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| The opportunity for religion in the present world situation | | 1919 | Harry Frederick Ward | | | | | |
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| The opportunity in life underwriting: a study of the work of the life underwriter designed to guide the man who is seeking a permanent and profitable lifetime career | | 1935 | | | | | | |
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| Opportunity missed. | | 1925 | | | | | | |
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| The opportunity of education | | 1935 | James A. (James Aloysius) Farley | | | | | |
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| The opportunity schools of South Carolina: an experimental study | | 1932 | William S. (William Scott) Gray, J. W. (John Warren) Tilton, Wil Lou Gray | | | | | |
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| The opportunity to thin and prune in the northern Rocky Mountain and Intermountain regions / John H. Wikstrom, Charles A. Wellner. | | 1961 | | | | | | |
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| Opportunity | | 1932 | Andrew Soutar | | | | | |
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| Opposite borders | | 1928 | Clark R. McClelland | | | | | |
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| Opposites | | 1932 | George W. Kite | | | | | |
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| The opposites test | | 1925 | Andrew Tennant Wylie | | | | | |
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| Opposites | | 1933 | Lois. Kellogg | | | | | |
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| Opposition poetry in Nazi Germany | | 1962 | Charles W. (Charles Wesley) Hoffmann | | | | | |
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| The oppression and exodus: the story of Israel in Egypt in the eighteenth dynasty | | 1930 | Thorwald C. Thorson | | | | | |
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| Oppression, when will it end? Written by Judire J. F. Rutherford ... Brooklyn. N. Y. [etc.] International Bible students association, c 1929. 63 p. illus. la™. Includes advertising matter. | | 1929 | | | | | | |
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| Oppressive labor practices act: Hearings before a subcommittee of the Committee on Education and Labor, United States Senate, Seventy-sixth Congress, first session, on S. 1970, a bill to eliminate certain oppressive labor practices affecting interstate and foreign commerce, and for other purposes. May 25 and 26, and June 1, 2, 5, 6, 7, and 13, 1939 | | 1939 | | | | | | |
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| Oprørere: Lars Rastgårds ungdom; roman | | 1934 | Peter Egge | | | | | |
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| Opracował Bronisław ṡelski | | 1914 | Bronisław. ṡelski | | | | | |
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| Opsonins and vaccines in medicine and surgery | | 1908 | Norman Edward Ditman, Nathaniel Bowditch Potter, Ernest B. Bradley | | | | | |
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| The optic and microscopic characters of artificial minerals | | 1928 | Alexander Newton Winchell | | | | | |
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| Optic projection, principles, installation, and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine | | 1914 | Henry Phelps Gage, Simon Henry Gage | | | | | |
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| Optic views and impressions of the National soldiers' home, South branch N. H. D. V. S., near Hampton, Virginia, as seen and described by one of its members | | 1910 | Edward L. Cobb | | | | | |
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| Optical aids for low acuity. | | 1957 | | | | | | |
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| Optical analog for a symmetric quadrupole / by Jonathan D. Young. | | 1960 | | | | | | |
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| Optical and mechanical characteristics of 16-millimeter motion-picture projectors | | 1942 | Robert Eugene Stephens | | | | | |
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| Optical emission from electron irradiated thin gold foils / D.C. Hammer ... [et al.]. | | 1963 | | | | | | |
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| Optical emission from irradiated thin metallic foils / Frank, A. L. ... [et al.]. | | 1962 | | | | | | |
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| Optical formulae and mnemonics of ophthalmology | | 1929 | H. James Lowings | | | | | |
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| Optical formulae and mnemonics of ophthalmology | | 1929 | H. James Lowings | | | | | |
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| Optical glass at the National Bureau of Standards / by Francis W. Glaze and Clarence H. Hahner. | | 1948 | | | | | | |
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| Optical image evaluation: proceedings of NBS semicentennial symposium on optical image evaluation held at the NBS on October 18, 19, and 20, 1951 | | 1954 | | | | | | |
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| Optical instruments | | 1945 | Earle B. Brown | | | | | |
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| Optical laboratory specialist | | 1957 | | | | | | |
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| Optical materials for infrared instrumentation; state-of-the-art report [by] Stanley S. Ballard, Kathryn A. McCarthy [and] William L. Wolfe. | | 1959 | | | | | | |
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| An optical primer | | 1916 | Charles H. Pixley | | | | | |
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| Optical properties and X-ray diffraction data for some inorganic fluoride and chloride compounds / H. Insley, ... [et. al.]. | | 1956 | | | | | | |
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| The optical properties of crystals: with a general introduction to their physical properties | 1st ed. | 1910 | Bethell Howard Jackson, Paul Heinrich Groth | | | | | |
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| The optical properties of some inorganic fluoride and chloride compounds / by T.N. McVay [and] G.D. White. | | 1954 | | | | | | |
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| Optical properties of UFâ‚„ / W.W. Harris, R.A. Wolters. | | 1948 | | | | | | |
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| Optical Radiation Measurements: The 1973 NBS Scale of Spectral Irradiance | | 1977 | Robert D. Saunders, J. B. Shumaker | | | | | |
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| The optical shop and counter | | 1934 | Alf Henry Johnsen, joint author Bertram A. Weeks, Frederick H. Weller | | | | | |
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| Optical shop practice | | 1920 | William Walter Merritt | | | | | |
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| Optical tooling for precise manufacture and alignment | | 1962 | Philip Kissam | | | | | |
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| The opticians' dispensing manual | | 1932 | Edward T. Hartinger | | | | | |
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| Optics | [3d ed., 3d print.] | 1949 | Francis Weston Sears | | | | | |
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| Optics, an introduction for ophthalmologists | | 1961 | Kenneth N. (Kenneth Neil) Ogle | | | | | |
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| Optics for photographers | | 1918 | Frank Roy Fraprie, Hans Harting | | | | | |
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| Optics. | | 1956 | | | | | | |
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| Optics. | | 1958 | | | | | | |
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| Optics. | | 1945 | | | | | | |
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| OPTIK: an IBM 709 computer program for the optics of high-energy particle beams / by Thomas J. Devlin. | | 1961 | | | | | | |
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| Optik; ein lehrbuch der elektromagnetischen lichttheorie. von dr. Max Born ... Mit 252 figuren. Berlin, J. Springer, | | 1933 | | | | | | |
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| Optimism: an essay | | 1903 | Helen Keller | | | | | |
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| The optimism book for offices | | 1918 | Robert E. Ramsay, Alex | | | | | |
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| The optimism of pre-millennialism | | 1927 | H. C. (Henry Clay) Morrison | | | | | |
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| Optimisme maçonnique | | 1936 | comte de Edmond Fels | | | | | |
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| The optimist | | 1922 | E. M. Delafield | | | | | |
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| Optimist sein, mein herr! | | 1934 | Hermann Schneider, Emmerich Huber | | | | | |
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| The optimist | | 1922 | E. M. Delafield | | | | | |
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| The optimist | | 1928 | Thomas Millard Henry | | | | | |
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| The optimist | | 1917 | Susan Taber | | | | | |
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| Optimistic America | | 1933 | Guy Vaughan Price | | | | | |
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| An optimistic journey | | 1926 | Cecilia Forrester | | | | | |
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| Optimistic medicine, or, The early treatment of simple problems rather than the late treatment of serious problems / by a former insurance man. | | 1920 | | | | | | |
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| Optimistic medicine; or, Tlie early treatment of simple problems rather than the late treatment of serious problems | | 1924 | Arthur Gr. Crandall | | | | | |
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| Optimistic voices ; little messages of cheer and hope, ed | | 1911 | O. S. Hoffman, Horace Fletcher | | | | | |
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| Optimos | | 1910 | Horace Traubel | | | | | |
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| Optimum design of mechanical elements | | 1961 | Ray C. Johnson | | | | | |
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| Optimum fixation period for visual search / by James L. Harris | | 1959 | | | | | | |
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| Optimum health | | 1935 | Adelle Davis | | | | | |
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| Optimum properties of analysis of variance tests based on model II and some generalizations of model II | [Rev.]. | 1957 | Leon H. Herbach | | | | | |
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| Options | | 1925 | O. Henry | | | | | |
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| Optique cristalline, double réfraction, polarisation rectiligne et elliptique | | 1925 | H. (Henri) Bouasse | | | | | |
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| Optique cristalline, polarisation rotatoire, états mésomorphes | | 1925 | H. (Henri) Bouasse | | | | | |
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| Optique géométrique élémentaire: focométrie, optométrie | | 1917 | H. (Henri) Bouasse | | | | | |
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| Optique géométrique supérieure | | 1917 | H. (Henri) Bouasse | | | | | |
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| Optique industrielle | | 1920 | Emile Turrière | | | | | |
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| Optokinetic nystagmus, its use in topical neuro-ophthalmologic diagnosis | | 1963 | J. Lawton (Joseph Lawton) Smith | | | | | |
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| Optometric practice management | [1st ed.] | 1963 | George P. Elmstrom | | | | | |
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| Optometric procedure, basic and supplementary | | 1941 | Elmer E. Hotaling, Elmer Le Roy Ryer | | | | | |
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| The optometrist's dictionary | | 1949 | Jerome Frank Slutzky | | | | | |
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| Optometrist's manual: a treatise on the science and practice of optometry | | 1921 | Christian Henry Brown | | | | | |
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| Optometry feature service | | 1928 | C. H. Tuck | | | | | |
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| Optometry: professional, economic and legal aspects | | 1948 | Henry W. Hofstetter | | | | | |
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| Optotypes, consisting of test-letters and pictographs for measuring the acuteness of vision | | 1923 | John Green, Arthur Eugene Ewing | | | | | |
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| Opus 21: descriptive music for the Lower Kinsey epoch of the atomic age: a concerto for a one-man band, six arias for soap operas, fugues, anthems & barrelhouse | | 1949 | Philip Wylie | | | | | |
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| The Opus majus of Roger Bacon | | 1928 | Roger Bacon, Robert Belle Burke | | | | | |
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| Opvs I, Kay Monroe pseud | | 1917 | Kennett Monroe Miller | | | | | |
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| Or,e:anization and mana,2:ement of business corporations in Ohio | | 1915 | IIo | | | | | |
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| Orígenes del español, estado lingüístico de la Península ibérica hasta el siglo xi | | 1926 | Ramón Menéndez Pidal | | | | | |
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| Oracle | | 1921 | Eugenie Julier Macaulay Bragdon, Claude Fayette Bragdon | | | | | |
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| The Oracle: a handy Jewish reference book | | 1935 | Carl Alpert | | | | | |
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Public Domain Books