Authors: O
- Smeaton, William Henry Oliphant 1856-1914 3 books
- Spengler, Oswald 1880-1936 3 books
- Lampén, O. E. 1880-1925 3 books
- Rank, Otto 1884-1939 3 books
- Frothingham, Octavius Brooks 1822-1895 3 books
- Orr, Charles Ebert 1861-1933 3 books
- Oliveira Martins, J. P. (Joaquim Pedro) 1845-1894 3 books
- McCannell, Otway 1883-1969 3 books
- Ordine della Santissima Annunziata - 3 books
- Okey, Thomas 1852-1935 3 books
- Rodríguez de Montalvo, Garci - 3 books
- Oemler, Marie Conway 1879-1932 3 books
- Geerling, O. (Otto) 1850-1930 3 books
- Ottolengui, Rodrigues 1861-1937 3 books
- Micheaux, Oscar 1884-1951 3 books
- Öhrvall, Hjalmar 1851-1929 3 books
- Cortazzo, Oreste 1836-1912 3 books
- Villa-Moura, Bento de Oliveira Cardoso, Visconde de 1877-1935 3 books
- Lytton, Edward Robert Bulwer Lytton, Earl of 1831-1891 3 books
- Niemann, August 1839-1919 3 books
- United States. National Park Service. Division of Publications - 3 books
- Davis, Owen 1874-1956 3 books
- Ruyra, Joaquín 1858-1939 3 books
- Hertwig, Oscar 1849-1922 3 books
- Donner, Otto 1835-1909 3 books
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