Authors: O
- Oliver, J. T. (Joseph Tombs) 1927-1988 1 book
- Cohen, Octavus Roy 1891-1959 1 book
- Oswell, G. D. (George Devereux) 1851-1910 1 book
- Anderson, Osborne P. (Osborne Perry) 1830-1872 1 book
- Ortega y Frías, Ramón 1825-1883 1 book
- Thatcher, Oliver J. (Oliver Joseph) 1857-1937 1 book
- Women's Co-operative Guild - 1 book
- Schoenrich, Otto 1876- 1 book
- Oluf, Hark 1708-1754 1 book
- Olson, Virgil J. - 1 book
- Boise, O. B. (Otis Bardwell) 1844-1912 1 book
- Vaughan, Arthur Owen - 1 book
- Oldenburg, Henry -1677 1 book
- Boyle, Roger, Earl of Orrery 1621-1679 1 book
- Ollier, Edmund 1827-1886 1 book
- Ogden, Antoinette - 1 book
- O'Brien, John 1878-1952 1 book
- Oldham, Thomas - 1 book
- Larssen, Otto 1864-1910 1 book
- Barrett, Orvey S. - 1 book
- Ellis, O. O. (Olin Oglesby) 1886- 1 book
- Sylvester, O. R. - 1 book
- Finsch, O. (Otto) 1839-1917 1 book
- Schwink, Otto - 1 book
- Ogilvie, John 1732-1813 1 book
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