United States. Census Office. 6th census, 1840, & United States. National Archives and Records Service. (1967). 1840 census schedules of mines, agriculture, commerce, and manufacturing for Ohio. National Archives, National Archives and Records Service, General Services Administration.
Style de citation Chicago (17e éd.)United States. Census Office. 6th census, 1840, et United States. National Archives and Records Service. 1840 Census Schedules of Mines, Agriculture, Commerce, and Manufacturing for Ohio. Washington: National Archives, National Archives and Records Service, General Services Administration, 1967.
Style de citation MLA (8e éd.)United States. Census Office. 6th census, 1840, et United States. National Archives and Records Service. 1840 Census Schedules of Mines, Agriculture, Commerce, and Manufacturing for Ohio. National Archives, National Archives and Records Service, General Services Administration, 1967.