Authors: O
- Ogden, Henry N. (Henry Neely) 1868- 2 books
- Ostrander, Stephen M. - 2 books
- Otté, E. C. (Elise C.) 1818-1903 2 books
- O'Brien, Seumas 1880- 2 books
- Warter, John Wood 1806-1878 2 books
- Oldmixon, Mr. (John) 1673-1742 2 books
- Sloane, T. O'Conor (Thomas O'Conor) 1851-1940 2 books
- MacLean, John 1851-1928 2 books
- Lewis, Harriet 1841-1878 2 books
- Super, O. B. (Ovando Byron) 1848-1935 2 books
- Hodder, Edwin 1837-1904 2 books
- Ortega y Gasset, José 1883-1955 2 books
- Orton, Helen Fuller 1872-1955 2 books
- Henne am Rhyn, Otto 1828-1914 2 books
- Tiuppa, Otto 1872-1914 2 books
- Jones, Owen 1809-1874 2 books
- Odum, Howard Washington 1884-1954 2 books
- O'Donoghue, Power, Mrs. 1858- 2 books
- White Sands Missile Range (N.M.). Public Affairs Office - 2 books
- Hultsch, Fridericus (Friedrich Otto) 1833-1906 2 books
- Bland, J. O. P. (John Otway Percy) 1863-1945 2 books
- Orpen, Adela E. (Adela Elizabeth Richards) 1855-1927 2 books
- Kotzebue, Otto von 1787-1846 2 books
- Müller, Karl Otfried 1797-1840 2 books
- Tudeer, O. E. (Oskar Emil) 1850-1930 2 books
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