- The Ontario Readers: Fourth Book (English) by Ontario Ministry of Education
- The Ontario Readers: The High School Reader, 1886 (English) by Education, Ministry of
- The Ontario Readers - Third Book (English) by Ontario Ministry of Education
- Ontario Teachers' Manuals: History (English) by Ontario Ministry of Education
- On the Advisableness of Improving Natural Knowledge (English) by Huxley, Thomas Henry
- On the Antiquity of the Chemical Art (English) by Mactear, James
- On The Art of Reading (English) by Quiller-Couch, Arthur Thomas, Sir
- On the Art of Writing - Lectures delivered in the University of Cambridge 1913-1914 (English) by Quiller-Couch, Arthur Thomas, Sir
- On the Banks of the Ohio (English) by McGuinn, Roger
- On The Blockade (English) by Optic, Oliver
- On the Choice of Books (English) by Carlyle, Thomas
- On the Church Steps (English) by Hallowell, Sarah C.
- On the Decay of the Art of Lying (English) by Twain, Mark
- On the Decay of the Art of Lying (English) by Twain, Mark
- On the Decay of the Art of Lying (English) by Twain, Mark
- On the Economy of Machinery and Manufactures (English) by Babbage, Charles
- On the Edge of the War Zone - From the Battle of the Marne to the Entrance of the Stars and Stripes (English) by Aldrich, Mildred
- On the Eve (English) by Garnett, Constance
- On the Eve (English) by Turgenev, Ivan Sergeevich
- On the Evolution of Language - First Annual Report of the Bureau of Ethnology to the - Secretary of the Smithsonian Institution, 1879-80, - Government Printing Office, Washington, 1881, pages 1-16 (English) by Powell, John Wesley
- On the Firing Line (English) by Fuller, Hamilton Brock
- On the Firing Line (English) by Ray, Anna Chapin
- On the Fringe of the Great Fight (English) by Nasmith, George G. (George Gallie)
- On the Frontier (English) by Harte, Bret
- On the Indian Sect of the Jainas (English) by Bühler, Johann Georg
- On the King's Service - Inward Glimpses of Men at Arms (English) by Logan, Innes
- On the Makaloa Mat (English) by London, Jack
- On the Method of Zadig (English) by Huxley, Thomas Henry
- On the Nature of Things (English) by Leonard, W. E.
- On the Nature of Things (English) by Lucretius
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