Authors: O
- Geerling, O. (Otto) 1850-1930 3 books
- Lytton, Edward Robert Bulwer Lytton, Earl of 1831-1891 3 books
- Oliver, Stephen 1950- 3 books
- Davis, Owen 1874-1956 3 books
- Winstedt, Eric Otto 1880-1955 3 books
- O'Shea, M. V. (Michael Vincent) 1866-1932 3 books
- Cortazzo, Oreste 1836-1912 3 books
- Ruyra, Joaquín 1858-1939 3 books
- Hertwig, Oscar 1849-1922 3 books
- Orr, Nathaniel - 3 books
- Niemann, August 1839-1919 3 books
- Old Humphrey 1787-1854 3 books
- Villa-Moura, Bento de Oliveira Cardoso, Visconde de 1877-1935 3 books
- Nuorteva, Väinö Albert 1889-1967 3 books
- Otis, Elizabeth - 3 books
- United States. National Park Service. Division of Publications - 3 books
- Donner, Otto 1835-1909 3 books
- Oppeln-Bronikowski, Friedrich von 1873-1936 3 books
- Orts-Ramos, Tomás 1866-1939 3 books
- D'Arbez 1856-1918 3 books
- Otlet, Paul 1868-1944 3 books
- O'Brien, R. Barry (Richard Barry) 1847-1918 3 books
- Otis, Charles P. (Charles Pomeroy) 1840-1888 3 books
- Presber, Rudolf 1868-1935 3 books
- Lyy, Toivo 1898-1976 3 books
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