Authors: O
- Niemann, August 1839-1919 3 books
- Donner, Otto 1835-1909 3 books
- Ruyra, Joaquín 1858-1939 3 books
- Friel, Arthur O. (Arthur Olney) 1885-1959 2 books
- Sverdrup, Otto Neumann 1854-1930 2 books
- Ayres, Alfred 1825-1902 2 books
- Homberg, Octave 1876-1941 2 books
- O'Reilly, John Boyle 1844-1890 2 books
- Oksanen, Vilho - 2 books
- Panizza, Oskar 1853-1921 2 books
- Baker, Olaf - 2 books
- O'Flaherty, Liam 1896-1984 2 books
- Fouché, Joseph, duc d'Otrante 1759-1820 2 books
- Olcott, Charles S. (Charles Sumner) 1864-1935 2 books
- Owen, J. A. (Jean Allan) 1841-1922 2 books
- Raymond, W. O. (William Odber) 1853-1923 2 books
- Hiller, Elizabeth O. -1941 2 books
- Call, Frank Oliver 1878-1956 2 books
- O'Sullivan, Vincent 1868-1940 2 books
- Okakura, Kakuzo 1862-1913 2 books
- Wenckstern, Otto von 1819-1869 2 books
- O'Hagan, Thomas 1855-1939 2 books
- MacLean, John 1851-1928 2 books
- Orton, James 1830-1877 2 books
- Neal, John 1793-1876 2 books
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