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- The old Black Rock ferry. Read before the society, December 14, 1863. By Charles D. Norton. by Norton, Charles Davis, 1820-1867. (1863)
- Old Caneadea council house and its last council fire. by Howland, Henry Raymond, b.1844 (1903)
- An old Kinderhook mansion, by Henry C. Van Schaack by Van Schaack, Henry Cruger, 1802-1887 (1878)
- The old and the new church. Two discourses: the first delivered on the 25th of May, 1856, as the closing sermon in the old Brick Church in Beekman Street: the last on the 31st of October, 1858, at the dedication of the new Brick Church on Murray Hill. by Spring, Gardiner, 1785-1873. (1858)
- An old frontier of France; the Niagara region and adjacent lakes under French control (Volume 1) by Severance, Frank H. (Frank Hayward), 1856-1931. (1917)
- An old frontier of France; the Niagara region and adjacent lakes under French control (Volume 2) by Severance, Frank H. (Frank Hayward), 1856-1931. (1917)
- The old streets of New York under the Dutch. A paper read before the New York historical society, June 2, 1874 by Gerard, James W. (James Watson), 1823-1900 (1875)
- One century in business, 1816-1916. by Frasse ( Peter A., ) and Company, Inc. (1916)
- Oneida Community 1848-1901. by Oneida, Ltd. (1901)
- Oneonta memories and sundry personal recollections of the author. by Huntington, Willard Vincent, 1856- (1891)
- The Onondaga historical association Syracuse, N. Y. [Its officers, history, charter, by-laws, members, donations, and relics] by Onondaga historical association, Syracuse, N. Y. (1865)
- Onondaga's part in the Civil War. Arranged for publication by E. P. Tanner and Alice E. Northrup. by Teall, Sarah Sumner (1915)
- Onondaga's soldiers of the Revolution. Official records, compiled by Frank H. Chase, secretary of the Onondaga Historical Association. by Chase, Franklin Henry, 1864- (1895)
- Ontario County, 1884-5 directory, containing the general directories of Canandaigua and Geneva, together with the Buiness Directories of all other villages in Ontario County, the Farmers' Directory and other miscellaneous information by Lant and Silvernail, Valatie, N. Y. (1885)
- Origin and history of the measures that led to the construction of the Erie canal... Written at the request of the Buffalo Historical Society, by George Geddes. 1866 by Geddes, George, 1809-1883 (1866)
- The origin of the name of Buffalo. Read before the Buffalo Historical Society, April 7, 1863. By William Ketchum, esq. by Ketchum, William (1863)
- Original book of New York deeds, January 1st, 1672/3 to October 19th,1675. by New York (City) (1913)
- Orlando Allen. Glimpses of life in the village of Buffalo. Read before the society, April 16, 1877. By William Cl Bryant. by Bryant, William Clement (1877)
- Our ancient landmarks. The sermon delivered in St. Paul's Church, Albany, on the bi-centennial commemoration of the city's charter, the fourth Sunday after Trinity, 1886 by Van Rensselaer, Maunsell, 1819-1900 (1886)
- Our neighbors the Tuscaroras, by Frank H. Severance. by Severance, Frank H. (Frank Hayward), 1856-1931. (1918)
- Our police courts; speeches of D. B. Eaton, esq., on the bill to secure better administration in the police courts of the City of New York, made before the Judiciary Committee of the Assembly, Feb. 7th and 13th, 1873. Printed by the Council of Political Reform, March, 1873, with an appendix relative to the three new bills on the same subject by Eaton, Dorman Bridgman, 1823-1899. (1873)
- Outline of the constitutional history of New York, an anniversary discourse, delivered at the request of the New York historical society, in the city of New York, November 19, 1847 by Butler, Benjamin Franklin, 1795-1858 (1848)