| Title | Edition | Year of Publication | Contributors | Country of Publication | Possible Copyright Status | Available Online? |
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| Behold life; design for liberation | | 1937 | William Dudley Pelley | |  | |  |  |
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| Birth, a new chance | | 1901 | Columbus Bradford | | | | | |
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| The blessed Trinity | | 1930 | Richard Downey | | | | | |
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| The blessed Trinity | | 1930 | Neil McNeil, Richard Downey | | | | | |
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| The certainties of the gospel | | 1935 | Wm. Childs (William Childs) Robinson | | | | | |    
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| Christianity and the Trinitarian doctrine | | 1936 | William Edward Smith | | | | | |
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| Christianity crucified | | 1932 | Henry Burr, Marguerite Beighton Pless | | | | | |
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| The church triumphant | | 1928 | John Peter Arendzen | | | | | |
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| The credibility of the Gospel miracles | | 1933 | Alfred William Price | | | | | |
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| Der dreielnige Gott in religonshistorischer beleuchtung | | 1922 | Ditlef Nielsen |  | | | | |
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| Der neue Gott, ein biblisch-theologischer Versuch über den Epheserbrief | | 1935 | Josef Dillersberger |  | | | | |
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| Did Paul know of the virgin birth?: An historical study | | 1926 | Richard J. (Richard Joseph) Cooke | | | | | |
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| Don Miguel Lehumada: discoverer of liquid from the sun's rays; an occult romance of Mexico and the United States | | 1906 | Sue Greenleaf | | | | | |
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| El dogma católico acerca de dios y sus tres personas | | 1930 | Francisco Marxuach |  | | | | |
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| The esoteric tradition | | 1935 | G. de (Gottfried) Purucker | | | | | |
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| The essay Let us think it over | | 1936 | | | | | | |
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| Essays on the Trinity and the incarnation | | 1928 | Arthur Darby Nock, Bp. of Derby Alfred Edward John Rawlinson, Frederick Dudley Vaughan Narborough | | | | | |
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| The eternal lover | | 1925 | Edgar Rice Burroughs | | | | | |
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| Full assurance: a series of messages for anxious souls | | 1937 | H. A. (Henry Allan) Ironside | | | | | |
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| Heaven: 1. What is it? 2. Where is it? 3. Its citizens. 4. The way. 5. Occupations | | 1912 | Henry Seymour Belden | | | | | |
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| Heaven: a place--a city--a home | | 1921 | Edward M. (Edward McKendree) Bounds | | | | | |
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| Heaven: an anthology | | 1935 | Reverend James J. Daly | | |  | | |
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| Heaven and Hell, also the world of spirts or intermediate state, from things heard and seen | | 1907 | Emanuel Swedenborg | | | | | |
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| Heaven and its wonders, and hell. | | 1909 | Emanuel Swedenborg | | | | | |
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| Heaven and its wonders and hell, from things heard and seen | | 1908 | John C. (John Curtis) Ager, Emanuel Swedenborg | | | | | |
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| Heavenly history: an account of heavenly architecture after Dante, Milton, Swedenborg and Blake, with a complete history of the genesis and hierarchy of the blessed angels and sundry apocrypha | | 1927 | Eleanor Follansbee | | | | | |
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| Immortality in the light of reason | | 1933 | Axel Emil Gibson | | | | | |
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| In this name: the doctrine of the Trinity in contemporary theology | | 1952 | Claude Welch | | | | | |
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| Incarnation: a plea from the Masters | | 1936 | Edith Ellis, (Spirit) Wilfred Brandon | | | | | |
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| La reencarnación (documentos para su estudio) | | 1927 | Gabriel Delanne | | | | | |
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| La Trinité: histoire, doctrine, pieté / par Valentin-M. Breton | | 1931 | Valentin Marie Breton |  | | | | |
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| The ladder of initiation | | 1934 | Mrs Frances (Grant) Buchanan | | | | | |
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| Le réveil | | 1917 | Edward Wodiska | | | | | |
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| Liquid from the sun's rays | | 1901 | Sue Greenleaf | | | | | |
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| "Long distance, please," | | 1936 | J. H. | | | | | |
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| Mansions of the soul: the cosmic conception | | 1930 | H. Spencer (Harvey Spencer) Lewis | | | | | |
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| Open the door! | | 1935 | Claude Bragdon, Edith Ellis, (Spirit) Wilfred Brandon | | | | | |
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| Out of shadows into light | | 1913 | His Eminence James, Charles J. (Charles Jerome) Callan | | | | | |
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| Personality and the Trinity | | 1935 | John Benjamin Champion | | | | | |
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| Recurring earth-lives, how and why: reincarnation described and explained | | 1921 | Frederick Milton Willis | | | | | |
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| Reincarnation | | 1925 | L. W. (Louis William) Rogers | | | | | |
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| Reincarnation: a universal truth | | 1928 | Ray Freeman Goudey | | | | | |
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| Reincarnation as a phenomenon of metamorphosis | | 1937 | Olin Dantzler Wannamaker, Guenther Wachsmuth | | | | | |
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| Reincarnation of immortality? | | 1899 | Ursula N. (Ursula Newell) Gestefeld | | | | | |
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| Reincarnation: the hope of the world | | 1927 | Irving S. (Irving Steiger) Cooper | | | | | |
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| Reincarnation | | 1928 | Richard Ingalese | | | | | |
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| Scientific support for Christian doctrines | | 1933 | J. Fulton Kiskaddon | | | | | |
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| Shall never perish | | 1936 | J. F. (John Frederick) Strombeck | | | | | |
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| She: a history of adventure | | 1926 | H. Rider (Henry Rider) Haggard | | | | | |
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| Signor: a segment from the eternal cycle | | 1917 | Katherine Herrington, Müliër. | | | | | |
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| Sojourners by the wayside: travelers on the long road | | 1917 | Müliër., Miilier | | | | | |
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| Soul science and immortality: The art of building a soul. The secret of the coming Christ. Authorized text book of the Church of illumination | | 1911 | R. Swinburne (Reuben Swinburne) Clymer | | | | | |
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| The star rover | | 1915 | Jack London | | | | | |
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| Studies in the birth of the Lord | | 1932 | Elwood Worcester | | | | | |
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| A thousand years of yesterdays: a strange story of mystic revelations | | 1920 | H. Spencer (Harvey Spencer) Lewis, Reverend George E. Chambers | | | | | |
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| The three divine virtues | | 1925 | Ildephonse Lanslots | | | | | |
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| The Trinity | | 1910 | Francis J. (Francis Joseph) Hall | | | | | |
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| The Trinity and God the Creator: a commentary on St. Thomas' Theological summa, ia, 27-119 | | 1952 | Réginald Garrigou-Lagrange | | | | | |
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| The triune God | | 1937 | Charles Norman Bartlett | | | | | |
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| Vedânta philosophy : five lectures on reincarnation | | 1907 | Swami Abhedānanda | | | | | |
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| Vedânta philosophy; three lectures | | 1899 | Swami Abhedānanda | | | | | |
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| The virgin birth: a study of the argument, for and against | | 1926 | F. P. (Franklin Pierce) Ramsay | | | | | |
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| The virgin birth of Christ | | 1930 | J. Gresham (John Gresham) Machen | | | | | |
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| The virgin birth of Jesus Christ | | 1933 | Hubert Vecchierello | | | | | |
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| The virgin birth | | 1925 | Martin J. (Martin Jerome) Scott | | | | | |
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| The virgin birth | | 1907 | Bernhard Pick, Richard H. Grützmacher | | | | | |
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| Von dem himmel und seinen wunderdingen | | 1869 | J. F. I. (Johann Friedrich Immanuel) Tafel, Emanuel Swedenborg | | | | | |
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| The way of stars: a romance of reincarnation | | 1925 | L. Adams (Lily Adams) Beck | | | | | |
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| What Jesus said about heaven: a study in the four Gospels | | 1925 | J. T. (Jesse T.) Whitley | | | | | |
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| Where are the dead? | | 1914 | Len G. (Len Gaston) Broughton | | | | | |
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| Why two worlds?: The relation of physical to spiritual realities | | 1934 | Fred Sidney Mayer | | | | | |
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| The world within | | 1957 | Gina. Cerminara | | | | | |
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| You have lived before! | | 1936 | Gervée. Baronte | | | | | |
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Public Domain Books