Fort Jefferson, Ohio
From Infogalactic: the planetary knowledge core
- U.S. Geological Survey Geographic Names Information System: Fort Jefferson, Ohio
- "Darke County". Jim Forte Postal History. Retrieved 25 December 2015.
- Wilson, Frazer Ells (1914). History of Darke County, Ohio, from its earliest settlement to the present time, Vol. 1. Milford, Ohio: Hobart Publishing Company. p. 580.
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