| Title | Edition | Year of Publication | Contributors | Country of Publication | Possible Copyright Status | Available Online? |
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| After life in Roman paganism | | 1922 | Franz Valery Marie Cumont | |  |  | | |    
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| Anthropos and Son of man: a study in the religious syncretism of the Hellenistic Orient | | 1927 | Carl H. (Carl Hermann) Kraeling | | | | | |
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| Aspects of religious belief and practice in Babylonia and Assyria | | 1911 | Morris Jastrow, Jr. | | | | | |
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| Astrology and religion among the Greeks and Romans | | 1912 | Franz Valery Marie Cumont | | | | | |
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| Atheism in pagan antiquity | | 1922 | A. B. (Anders Björn) Drachmann, Ingeborg Andersen | | |  | | |
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| Bildermappe mit 273 abbildungen samt erklärungen zur religion Babyloniens und Assyriens: besonders im anschluss und als ergänzung zu Jastrow's Religion Babyloniens und Assyriens | | 1912 | Morris Jastrow, Jr. |  | | | | |
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| Cuneiform parallels to the Old Testament | | 1926 | Robert William Rogers | | | | | |
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| Cuneiform parallels to the Old Testament | | 1912 | Robert William Rogers | | | | | |
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| De Feriis Anni Romanorum Vetustissimi Observationes Selectae | | 1891 | Georg Wissowa | | | | | |
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| Die mysterien des Mithra | 2. verm. und verb. aufl. | 1911 | Georg Gehrich, Franz Valery Marie Cumont | | | | | |
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| Die orientalischen religionen im römischen heidentum: vorlesungen am Collège de France | 2., verb. und verm. aufl. | 1914 | Georg Gehrich, Franz Valery Marie Cumont | | | | | |
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| Die religion der Babylonier und Assyrer | | 1921 | Arthur Ungnad |  | | | | |
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| Eros and Psyche: a fairy tale of ancient Greece | | 1928 | Charles Henry Chase | | | | | |
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| La Frammassoneria Figlia ed Erede del Manicheismo: Studii Storici | | 1866 | Luigi Parascandolo |  | | | | |
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| Le monde gréco-romain au temps de Notre Seigneur | | 1935 | A. J. (André Jean) Festugière, Pierre Fabre |  | | | | |
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| Mithra, Zoroastre et la préhistoire aryenne du christianisme. Avec vingt-trois illustrations hors texte | | 1935 | Charles Autran | | | | | |
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| The Mithraic mysteries restored and modernized | | 1925 | Kenneth Sylvan Guthrie | | | | | |
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| Mithraism | | 1915 | W. J. (William John) Phythian-Adams | | | | | |
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| Mithraism and Christianity: a study in comparative religion | | 1921 | L. (Leonard) Patterson, Leonard Patterson | | | | | |
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| Mystic Italy | | 1928 | Michael Ivanovitch Rostovzeff | | | | | |
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| Neoplatonism of the Italian Renaissance | | 1935 | Nesca A. (Nesca Adeline) Robb | | | | | |
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| Numenius of Apamea, the father of neo-Platonism: works, biography, message, sources, and influence | | 1917 | Kenneth Sylvan Guthrie | | | | | |
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| The oriental religions in Roman paganism | | 1911 | Grant Showerman, Franz Valery Marie Cumont | | | | | |
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| The pagan divinities and their worship as depicted in the works of Saint Augustine exclusive of the City of God | | 1930 | Sister Mary Daniel Madden | | | | | |
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| Pagan ideas of immortality during the early Roman empire | | 1918 | Clifford Herschel Moore | | | | | |
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| Pagan regeneration : a study of mystery initiations in the Graeco-Roman world | | 1929 | Harold R. (Harold Rideout) Willoughby | | | | | |
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| Phases in the religion of ancient Rome | | 1932 | Cyril Bailey | | | | | |
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| Plotin et le paganisme religieux | | 1933 | Édouard Krakowski | | | | | |
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| Religion in Plato and Cicero | | 1959 | John E. Rexine | | | | | |
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| The religious experience of the Roman people, from the earliest times to the age of Augustus: the Gifford lectures for 1909-10 | | 1911 | W. Warde (William Warde) Fowler | | | | | |
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| Researches in Manichaeism: with special reference to the Turfan fragments | | 1932 | A. V. W. Jackson, A. V. Williams (Abraham Valentine Williams) Jackson | | | | | |
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| Sumerian texts of varied contents | | 1934 | Edward Chiera, Samuel Noah Kramer | | | | | |
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| Survivals of Roman religion | | 1963 | Gordon Jennings Laing | | | | | |
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| This believing world: a simple account of the great religions of mankind | | 1926 | Lewis Browne | | | | | |
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| Étude sur Les epistres morales d'Honoré d'Urfé ... par soeur Marie Lucien Goudard | | 1933 | Sister Marie Lucien Goudard | | | | | |
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| Why Rome fell | | 1927 | Edward Lucas White | | | | | |
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Public Domain Books