Authors: O
- Wallin, Johan Olof 1779-1839 1 book
- Hay, Oliver Perry 1846-1930 1 book
- Spencer, Orson 1802-1855 1 book
- Hopp, Otto - 1 book
- Smith, Otterbein Oscar 1858- 1 book
- Oppenheim, J. - 1 book
- Osimo, Vittorio 1877- 1 book
- Adams, O. S. - 1 book
- Stieglitz, Julius 1867-1937 1 book
- Horne, Olive Brown - 1 book
- Nagel, Oskar 1874- 1 book
- Orton, Arthur W. - 1 book
- Augustus, Emperor of Rome -63-14 1 book
- Ostwald, Hans 1873-1940 1 book
- Chrisman, Oscar 1855-1929 1 book
- Burke, Oliver J. (Oliver Joseph) 1825-1889 1 book
- Owen, Derwyn Trevor 1876-1947 1 book
- Williams, Alfred 1877-1930 1 book
- Orage, A. R. (Alfred Richard) 1873-1934 1 book
- De Presno, Odd 1944- 1 book
- Adams, Otto H. (Otto Henry) 1893-1981 1 book
- Webb, Olin L. - 1 book
- Offenbecker, Larry 1913-2011 1 book
- Ketcham, Orman Wesley 1865-1950 1 book
- Stewart, Oliver, Major 1895-1976 1 book
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