Authors: O
- Richardson, Dorothy M. (Dorothy Miller) 1873-1957 11 books
- Ontario. Department of Education - 10 books
- Ohio State University. Biological Club - 10 books
- Oxenham, John 1852-1941 10 books
- Railo, Eino 1884-1948 10 books
- Buek, Otto 1873-1966 10 books
- Wright, Mabel Osgood 1859-1934 10 books
- Osborn, Henry Fairfield 1857-1935 10 books
- O'Donnell, Elliott 1872-1965 10 books
- Ruck, Berta 1878-1978 10 books
- Oxley, J. Macdonald (James Macdonald) 1855-1907 10 books
- O'Rell, Max 1848-1903 9 books
- Lodge, Oliver, Sir 1851-1940 9 books
- Osler, William, Sir 1849-1919 9 books
- Pain, Barry 1864-1928 9 books
- Huch, Ricarda 1864-1947 9 books
- Kallio, O. A. (Oskar Albin) 1874-1940 8 books
- Dorsey, James Owen 1848-1895 8 books
- Omelka, František 1904-1960 8 books
- Bartlett, Frederick Orin 1876-1945 8 books
- Old Sleuth 1837-1898 8 books
- Mirbeau, Octave 1848-1917 8 books
- Olmsted, Frederick Law 1822-1903 8 books
- Schreiner, Olive 1855-1920 8 books
- Picón, Jacinto Octavio 1852-1923 7 books
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