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O
O'Callaghan, Edmund Bailey, 1797-1880.
O'Conor, Charles, 1804-1884.
Olds, Gamaliel Smith, 1777-1848.
Olmsted, John Bartow, b. 1854.
Oneida Historical Society
Oneida, Ltd.
- Oneida Community 1848-1901. (1901)
Onondaga Club.
Onondaga Historical Association, Syracuse, N.Y.
- Local history leaflet. (1896-1904)
- Manual of the Onondaga historical association. (1906)
- The Onondaga historical association Syracuse, N. Y. [Its officers, history, charter, by-laws, members, donations, and relics] (1865)
Oppenheim, Samuel, 1857-1928
Osborn, Henry Fairfield, 1857-1935.
Osborn, William Church.
Osgood, Howard Lawrence, 1855-1909
- Rochester; its founders and its founding, by Howard L. Osgood. Read before the Rochester Historical Society, April 13th, 1894 (1894)
- The struggle for Monroe County, by Howard L. Osgood. Read before the Rochester Historical Society, May 13, 1892. (1892)