Books in Category: Philosophy & Ethics (sorted alphabetically by author)
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The Buddhist Catechism
Henry Steel Olcott
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Arabic Thought and Its Place in History
De Lacy O'Leary
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Fashionable Philosophy, and Other Sketches
Laurence Oliphant
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A Little Pilgrim: Stories of the Seen and the Unseen
Mrs. Oliphant
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The Ethics of Medical Homicide and Mutilation
Austin O'Malley
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The Rubaiyat of Omar Khayyam
Omar Khayyam
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The Sufistic Quatrains of Omar Khayyam
Omar Khayyam
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Teltantekijän lauselmia (Finnish)
Omar Khayyam
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The Sufism of the Rubáiyát, or, the Secret of the Great Paradox
Omar Khayyam
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Ritual of the Order of the Eastern Star
Order of the Eastern Star. General Grand Chapter
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The writings of Origen, Vol. 1 (of 2)
Origen
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The writings of Origen, Vol. 2 (of 2)
Origen
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Dante and the early astronomers
M. A. Orr
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Meditaciones del Quijote (Spanish)
José Ortega y Gasset
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The Old Humanities and the New Science
Sir William Osler
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Man's Redemption of Man: A Lay Sermon
Sir William Osler
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A way of life : An address to Yale students Sunday evening, April 20th, 1913
Sir William Osler
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Natural Philosophy
Wilhelm Ostwald
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Feltalálók, felfedezők, nagy emberek (Hungarian)
Wilhelm Ostwald
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The Bible of nature : or, The principles of secularism. A contribution to the religion of the future
Felix L. Oswald
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The case against evolution
George Barry O'Toole
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Der Sprung aus dem Fenster (German)
Karl Otten
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A marxizmus társadalomelmélete : Elméleti kritika és történelmi tanulságok (Hungarian)
László Ottlik
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Naturalism and Religion
Rudolf Otto
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Why Authors Go Wrong, and Other Explanations
Grant M. Overton