Authors: O
- Tarkington, Booth 1869-1946 33 books
- Ouida 1839-1908 32 books
- Vandercook, Margaret 1876-1958 30 books
- Henry, O. 1862-1910 25 books
- Sheckley, Robert 1928-2005 23 books
- Mencken, H. L. (Henry Louis) 1880-1956 23 books
- Pakkala, Teuvo 1862-1925 21 books
- Scott, A. O. (Arthur Orange) 1880-1946 20 books
- Walpole, Horace 1717-1797 20 books
- Bedford-Jones, H. (Henry) 1887-1949 20 books
- Levy, Oscar 1867-1946 19 books
- Rathborne, St. George 1854-1938 18 books
- Feuillet, Octave 1821-1890 18 books
- Wister, Owen 1860-1938 18 books
- Watanna, Onoto 1875-1954 17 books
- Slesar, Henry 1927-2002 17 books
- Goldsmith, Oliver -1774 16 books
- Neville, Kris 1925-1980 16 books
- Åberg, J. O. (Johan Olof) 1843-1898 16 books
- Birmingham, George A. 1865-1950 16 books
- Joutsen, O. A. (Otto Aleksanteri) 1878-1936 16 books
- Ochoa, Enrique - 15 books
- Oman, Charles 1860-1946 15 books
- Järventaus, Arvi 1883-1939 15 books
- Reed, Myrtle 1874-1911 15 books
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