Ohio Department of Highways (1936). Official Highway Map of Ohio(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways. OCLC5673562. Retrieved April 2, 2017.
Ohio Department of Highways (1939). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7408341. Retrieved April 2, 2017.
Ohio Department of Highways (1940). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 54667346. Retrieved April 2, 2017.
Ohio Department of Highways (1972). Ohio Highway Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Highways. OCLC5673562, 13716527. Retrieved April 2, 2017.
Ohio Department of Transportation (1973). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562. Retrieved April 2, 2017.
Ohio Department of Highways (1939). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7408341. Retrieved April 2, 2017.
Ohio Department of Highways (1940). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 54667346. Retrieved April 2, 2017.
Ohio Department of Highways (1972). Ohio Highway Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Highways. OCLC5673562, 13716527. Retrieved April 2, 2017.
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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 April 2, 2017.
Ohio Department of Transportation (1973). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562. Retrieved April 2, 2017.