Authors: O
- Beaumont, Mary 1849-1910 1 book
- Choules, John Overton 1801-1856 1 book
- Dudfield, T. Orme - 1 book
- O'Hargan, Roderick - 1 book
- Bull, Ole 1810-1880 1 book
- Vernon, Robert O. (Robert Orion) 1912- 1 book
- Ohrwalder, Josef 1856-1913 1 book
- Schmidt, Walther R. - 1 book
- O'Connor, William Frederick Travers, Sir 1870-1943 1 book
- Ornsby, Robert 1820-1889 1 book
- United States. Executive Office of the President - 1 book
- Arima, Onni W. (Onni Wilhelm) 1865-1910 1 book
- Murie, Olaus J. (Olaus Johan) 1889-1963 1 book
- Dunham, Oscar M. - 1 book
- D'Ooge, Benjamin L. (Benjamin Leonard) 1860-1940 1 book
- O'Mahony, John 1816-1877 1 book
- Todd, Thomas Olman - 1 book
- O'Brien, Joseph - 1 book
- Pickard-Cambridge, Octavius 1828-1917 1 book
- Owen, Grace Arlington - 1 book
- Novikova, Olga Alekseevna 1840-1925 1 book
- O'Harra, Edwin V. - 1 book
- Pfungst, Oskar 1874-1933 1 book
- Ortega Munilla, J. (José) 1856-1922 1 book
- Ormsbee, J. - 1 book
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