Ohio Department of Highways (1936). Official Highway Map of Ohio(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways. OCLC5673562. Retrieved March 9, 2011.
Ohio Department of Highways (1969). Official Highway Map(PDF) (Map). c. 1:563,200. Columbus: Ohio Department of Highways. OCLC5673562, 7448779. Retrieved March 9, 2011.
Ohio Department of Highways (1971). Official Highway Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Highways. OCLC5673562. Retrieved March 9, 2011.
Ohio Department of Highways (1969). Official Highway Map(PDF) (Map). c. 1:563,200. Columbus: Ohio Department of Highways. OCLC5673562, 7448779. Retrieved March 9, 2011.
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Ohio Department of Highways (1936). Official Highway Map of Ohio(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways. OCLC5673562. Retrieved March 9, 2011.
Ohio Department of Highways (1971). Official Highway Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Highways. OCLC5673562. Retrieved March 9, 2011.