Ohio Department of Highways (1936). Official Highway Map of Ohio(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways. OCLC5673562. Retrieved September 16, 2013.
Ohio Department of Highways (1938). Ohio Official Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7453129. Retrieved September 16, 2013.
Ohio Department of Highways (1941). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7408262. Retrieved September 16, 2013.
Ohio Department of Highways (1942). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 54667349. Retrieved September 16, 2013.
Ohio Department of Highways (1955). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7448742. Retrieved September 16, 2013.
Ohio Department of Highways (1957). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7444259. Retrieved September 16, 2013.
Ohio Department of Highways (1938). Ohio Official Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7453129. Retrieved September 16, 2013.
Ohio Department of Highways (1941). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7408262. Retrieved September 16, 2013.
Ohio Department of Highways (1942). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 54667349. Retrieved September 16, 2013.
Ohio Department of Highways (1955). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7448742. Retrieved September 16, 2013.
Ohio Department of Highways (1957). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7444259. Retrieved September 16, 2013.
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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 September 16, 2013.