Authors: O
- Marden, Thomas Owen, Sir 1866- 1 book
- Lewis, Orlando Faulkland 1873-1922 1 book
- Dinneen, Patrick S. (Patrick Stephen) 1860-1934 1 book
- Olerich, Henry 1851-1927 1 book
- Ogle, Arthur 1871- 1 book
- Riese, Otto 1697-1779 1 book
- Saltarino, Signor 1863-1941 1 book
- Ferrall, S. A. (Simon Ansley) -1844 1 book
- Osborne, Oliver T. (Oliver Thomas) 1862-1940 1 book
- Chew, Tobias O. (Tobias Otterbein) 1885-1962 1 book
- O'Neil, Owen Rowe - 1 book
- Obecny, Edmund - 1 book
- Béliard, Octave 1876-1951 1 book
- Nuttall Ornithological Club - 1 book
- Stevens, William Oliver 1878-1955 1 book
- Obiols Delgado, Mariano -1911 1 book
- Shepard, Odell 1884-1967 1 book
- Stoessel, Albert 1894-1943 1 book
- Corvin, Otto von 1812-1886 1 book
- Nicholls, George, Sir 1781-1865 1 book
- New Zealand. Committee of Inquiry into Mental Defectives and Sexual Offenders - 1 book
- Kildare, Owen 1864-1911 1 book
- Van Slyke, D. O. (David Oyer) 1818-1890 1 book
- Wohlbrück, Olga 1867-1933 1 book
- Owensby, Clenton E. 1940- 1 book
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