"Number of Inhabitants: Ohio"(PDF). 18th Census of the United States. U.S. Census Bureau. 1960. Archived(PDF) from the original on February 17, 2022. Retrieved May 17, 2020.
"Number of Inhabitants: Ohio"(PDF). 18th Census of the United States. U.S. Census Bureau. 1960. Archived(PDF) from the original on February 17, 2022. Retrieved May 17, 2020.