Authors: O
- Omar Khayyam 1048-1122 7 books
- Orléans, Charlotte-Elisabeth, duchesse d' 1652-1722 7 books
- Dargan, Olive Tilford 1869-1968 7 books
- Flower, B. O. (Benjamin Orange) 1858-1918 7 books
- Nyman, O. E. 1888-1953 7 books
- Ostrander, Isabel 1883-1924 7 books
- O'Neill, Eugene 1888-1953 7 books
- Orcutt, William Dana 1870-1953 7 books
- Relander, O. (Oskar) 1863-1930 7 books
- Ahlqvist, August 1826-1889 7 books
- Oblinger, M. M. (Milo Milton) 1900- 7 books
- Picón, Jacinto Octavio 1852-1923 7 books
- Uzanne, Octave 1851-1931 7 books
- Oehlenschläger, Adam 1779-1850 7 books
- Ogden, Ruth 1853-1927 7 books
- Whitney, Orson F. (Orson Ferguson) 1855-1931 7 books
- O'Neill, Rose Cecil 1874-1944 6 books
- Tarvas, Toivo 1883-1937 6 books
- Victor, Metta Victoria Fuller 1831-1885 6 books
- Olfers, Sibylle 1881-1916 6 books
- Thanet, Octave 1850-1934 6 books
- Ogden, George W. (George Washington) 1871-1966 6 books
- Benson, Stella 1892-1933 6 books
- Overton, Grant M. (Grant Martin) 1887-1930 6 books
- Ikola, Jaakko 1887-1951 6 books
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