| Title | Edition | Year of Publication | Contributors | Country of Publication | Possible Copyright Status | Available Online? |
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| An address delivered at a general meeting of the citizens of the city of New-York | | 1929 | H. B. Drake, Barnabas Bates | |  | |  | |
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| Administrative furloughs in the Postal Service: Hearing before the committee on Post Offices and Post Roads United States Senate, Seventy-third Congress, second session, on S. 3523 a bill to discontinue Administrative Furloughs in the Postal Service, May 9, 1934 | | 1934 | | | | | | |
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| Air mail: Hearing[s] before subcommittee no. 4 of the Committee on the Post Office and Post Roads, House of Representatives, Seventy-fourth Congress, first session, on H. R. 3455, H. R. 3611, H. R. 4133, H. R. 4540. Tuesday, January 29, 1935, Monday, February 4, 1935 | | 1934 | | | | | | |
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| Air mail stamp album | | 1934 | John W. Nicklin | | | | | |
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| The air post stamps of Colombia | | 1935 | Frido W. Kessler | | | | | |
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| The airmail, Jennies to jets | | 1951 | Benjamin B. Lipsner, Len Hilts | | | | | | 
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| The American postal service, history of the postal service from the earliest times | | 1917 | Louis Melius | | | | | |
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| Ben Holladay: the stage coach king | | 1940 | J. V. (James Vincent) Frederick | | | | | |
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| The boy with the U. S. mail | | 1916 | Francis William Rolt-Wheeler | | | | |  |
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| The boys' book of the U.S. mails | | 1926 | Irving Crump, Harry S. New | | | | | |
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| A Chautauqua boy in '61 and afterward; reminiscences by David B. Parker, second lieutenant, Seventy-second New York, detailed superintendent of the mails of the Army of the Potomac, United States marshal, district of Virginia, chief post office inspector. | | 1912 | David B. (David Bigelow) Parker, Torrance Parker |  | | | | |
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| The Chinese air-post, 1920-1935 | | 1937 | James Starr, Samuel J. Mills | | | | | |
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| Colonial and revolutionary posts | | 1931 | Harry Myron Konwiser | | | | | |
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| Commercial Aviation - Air Mail Service : hearings before the Committee on the Post Office and Post Roads of the House of Representatives, Sixty-seventh Congress, second session, on H. R. 9462. Part 1, January 6, 1922. | | 1922 | | | | | | |
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| Coulon's parcel post guide | | 1926 | | | | | | |
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| Couriers of the clouds | | 1930 | Edward Shenton | | | | | |
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| Der briefbeföderungsdienst | | 1926 | |  | | | | |
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| Der postzeitungsdienst | | 1926 | Gerhard Raabe | | | | | |
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| Doctor Franklin, postmaster general | | 1928 | Ruth Lapham Butler | | | | | |
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| The economics of air mail transportation | | 1934 | Paul T. (Paul Theodore) David | | | | | |
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| Express and parcel post comparative rate guide | | 1915 | | | | | | |
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| Financial policy for the Post Office Department: a statement | | 1954 | | | | | | |
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| The first overland mail | | 1940 | Walter Barnes Lang | | | | | |
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| Fourth-class postmaster's salaries. Hearing before the committee on the Post Office and Post Roads, House of Representatives, Seventy-fourth Congress, second session, Wednesday, March 4, 1936. H. R. 2890. | | 1936 | | | | | | |
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| Geschichte der deutschen post | | 1928 | Heinrich von *Stephan, Karl Sautter | | | | | |
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| Gold rush steamers of the Pacific | | 1938 | Ernest A. (Ernest Abram) Wiltsee | | | | | |
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| Handy postal guide | | 1936 | | | | | | |
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| History of the "free franking" of mail in the United States | | 1936 | Edward Stern | | | | | |
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| Hoover Commission recommendations on Post Office and Civil Service: hearings before the Committee on Post Office and Civil Service, House of Representatives, Eighty-second Congress, first session, on | | 1951 | | | | | | |
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| How they carried the mail: from the post runners of King Sargon to the air mail of to-day | | 1930 | Frank Dobias, J. Walker McSpadden, Joseph Walker | | | | | |   
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| The international air post album: contains spaces for every major variety of government issue of air post stamp up to January 1st, 1934, chronicle of Scott's monthly journal, also statistical data, including dates of issue and historical information on outstanding flights | | 1934 | | | | | | |
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| The law on advertising | | 1929 | Earnest Elmo Calkins, Clowry Chapman | | | |  | |
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| Laws relating to postal air service | | 1938 | Elmer Adolph Lewis | | | | | |
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| Mail for the world: from the courier to the Universal Postal Union | | 1953 | Laurin Zilliacus | | | | | |
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| Old post bags | | 1928 | Alvin F. (Alvin Fay) Harlow, Joseph Stewart | | | | | |
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| Order number ten: being cursory comments on some of the effects of the great American fraud order | | 1911 | Edward Gardner Lewis | | | | | |
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| The overland mail 1849-1869: promoter of settlement, precursor of railroads | | 1926 | LeRoy R. Hafen, Le Roy Reuben Hefan | | | | | |
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| Pan American airways system: instructions for the handling and recording of air mails | | 1930 | | | | | | |
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| Parcel post manual: containing regulations governing the conduct of the parcel post system, together with rates from the post offices in "unit 465" to all other post offices in the United States | | 1913 | | | | | | |
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| Pneumatic mail tube systems. Hearings, June 18, 1935. | | 1935 | | | | | | |
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| Pneumatic-tube service. Hearing before the Committee on post offices and post roads, United States Senate, Sixty-fourth Congress, second session, on H. R. 19410... | | 1917 | | | | | | |
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| Pneumatic-tube service. Hearing before the Committee on Post Offices and Post Roads, United States Senate, Sixty-fourth Congress, first session, on H. R. 10484... | | 1916 | | | | | | |
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| The pony express goes through | | 1935 | Howard R. (Howard Roscoe) Driggs, William H. Jackson | | | | | |
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| The pony express: the record of a romantic adventure in business | | 1932 | Arthur Chapman | | | | | |
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| The Post Office as a public service: report to the Committee on Post Office and Civil Service, United States Senate, Eighty-fifth Congress, first session | | 1957 | | | | | | |
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| Post office dept. Examination instruction: a complete course of instruction for civil service examinations for post office clerk, city letter carrier, rural carrier, postmaster, for first, second, third and fourth class offices. Also complete, except for one subject, for railway mail clerk, full description of examination for post office inspector | 4th ed. ... | 1919 | Solomon Hecht | | | | | |
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| Post office dept: Examination instruction for candidates for postal clerk, letter carrier, r'y mail clerk, rural carrier, inspector & 4th cl. postmaster, and instruction for middle grade clerical examinations generally. 110,000 words of simple instruction, with 350 ques. & answers | (Enl., rev., 3d ed.) | 1916 | Solomon Hecht | | | | | |
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| Post-office and rural carrier civil service couse: a complete preparatory course of instruction for the use of students who are preparing for the government examinations | 2d ed. | 1920 | Charles Foster McDaniel | | | | | |
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| Postal affairs and the national economy | | 1935 | James A. (James Aloysius) Farley | | | | | |
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| Postal clerk and letter carrier examination instruction, including fourth class postmaster and inspector and instruction for middle grade clerical examinations generally | | 1913 | | | | | | |
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| Postal clerk and letter carrier: how to enter the service of the Post office department | | 1922 | Charles Liebman | | | | | |
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| The postal service | (6th ed.) | 1914 | | | | | | |
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| The postal service of the Confederate States of America | | 1929 | August Dietz | | | | | |
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| The postal service | (5th ed.) | 1912 | Joseph John Edward O'Reilly | | | | | |
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| Questions and answers for civil service, railway poastal clerk and clerk-carrier positions | | 1933 | Herbert F. Ward | | | | | |
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| Questions and answers for civil service railway postal clerk and clerk-carrier positions | Rev. ed. | 1935 | Herbert F. Ward | | | | | |
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| Rate policies and rate practices of the United State Post Office | | 1953 | Jules Backman | | | | | |
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| Regulating postal rates. Hearings before the Committee on Post Offices and Post Roads, United States Senate, Seventieth Congress, first session, on S. 808, S. 843, S. 1459, S. 2040, and H.R. 12030, bills to regulate postal rates, and for other purposes. April 17 and 18, 1928 ... | | 1928 | | | | | | |
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| The siege of University City: the Dreyfus case of America | | 1912 | Sidney Levi Morse | | | | | |
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| Speed-test systems--Postal service. Hearings before a subcommittee of the Committee on the Post Office and Post Roads, House of Representatives, Sixty-eighth Congress, second session, on H.R. 11705. February 25, 1925. | | 1925 | | | | | | |
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| The story of the pony express: an account of the most remarkable mail service ever in existence, and its place in history | | 1913 | Glenn D. (Glenn Danford) Bradley | | | | | |
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| Threatening communications in the mails. Hearing before a subcommittee of the Committee on the Post Office and Post Roads, House of Representatives, Seventy-fourth Congress, first session, on H. R. 6717, a bill to amend section 1 of the act of July 8, 1932. April 23, 1935. | | 1935 | | | | | | |
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| The U. S. government's shame: The story of the great Lewis case | | 1908 | Edwin Charles Madden | | | | | |
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| Uncle Sam's secrets: a story of national affairs for the youth of the nation | | 1916 | Oscar Phelps Austin | | | | | |
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| The United States post office, its past record, present condition, and potential relation to the new world era | | 1917 | Daniel C. (Daniel Calhoun) Roper | | | | | |
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| Ward's questions and answers for railway postal clerk and clerk-carrier preparation | | 1929 | Herbert F. Ward | | | | | |
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| William Goddard, newspaperman | | 1962 | Ward L. Miner | | | | | |
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Public Domain Books