- Original Short Stories — Volume 03 (English) by McMaster, Albert M.C.
- Original Short Stories — Volume 03 (English) by Quesada, Mme.
- Original Short Stories — Volume 04 (English) by Henderson, A.E.
- Original Short Stories — Volume 04 (English) by Maupassant, Guy de
- Original Short Stories — Volume 04 (English) by McMaster, Albert M.C.
- Original Short Stories — Volume 04 (English) by Quesada, Mme.
- Original Short Stories — Volume 05 (English) by Henderson, A.E.
- Original Short Stories — Volume 05 (English) by Maupassant, Guy de
- Original Short Stories — Volume 05 (English) by McMaster, Albert M.C.
- Original Short Stories — Volume 05 (English) by Quesada, Mme.
- Original Short Stories — Volume 06 (English) by Maupassant, Guy de
- Original Short Stories — Volume 07 (English) by Maupassant, Guy de
- Original Short Stories — Volume 08 (English) by Maupassant, Guy de
- Original Short Stories — Volume 09 (English) by Maupassant, Guy de
- Original Short Stories — Volume 10 (English) by Maupassant, Guy de
- Original Short Stories — Volume 11 (English) by Maupassant, Guy de
- Original Short Stories — Volume 12 (English) by Maupassant, Guy de
- Original Short Stories — Volume 13 (English) by Maupassant, Guy de
- The Origin and Deeds of the Goths (English) by Jordanes
- Origin and Development of Form and Ornament in Ceramic Art. - Fourth Annual Report of the Bureau of Ethnology to the - Secretary of the Smithsonian Institution, 1882-1883, - Government Printing Office, Washington, 1886, pages 437-466. (English) by Holmes, William Henry
- Origin and Nature of Emotions (English) by Crile, George W. (Washington)
- The Origin and Permanent Value of the Old Testament (English) by Kent, Charles Foster
- Origin of Species (English) by Huxley, Thomas Henry
- The Origin of Species by means of Natural Selection, 6th Edition (English) by Darwin, Charles
- Origin of the Anglo-Boer War Revealed (2nd ed.) - The Conspiracy of the 19th Century Unmasked (English) by Thomas, C. H.
- Orjan oppi (Finnish) by Järnefelt, Arvid
- Orjien vapauttaminen Pohjois-Amerikassa (Finnish) by Gripenberg, Alexandra
- Orlando Furioso (English) by Ariosto, Lodovico
- Orlando Furioso (Italian) by Ariosto, Lodovico
- Orpheus in Mayfair and Other Stories and Sketches (English) by Baring, Maurice
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