Ohio Department of Highways and Public Works (July 1923). Map of Ohio Showing State Routes(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways and Public Works. Retrieved October 1, 2013.
Ohio Department of Highways and Public Works (August 1, 1926). Map of Ohio Showing State Routes(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways and Public Works. OCLC5673562. Retrieved October 1, 2013.
Ohio Department of Highways and Public Works (June 1, 1927). Map of Ohio Showing State Routes(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways and Public Works. OCLC5673562. Retrieved October 1, 2013.
Ohio Department of Highways (1938). Ohio Official Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7453129. Retrieved October 1, 2013.
Ohio Department of Highways (1939). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7408341. Retrieved October 1, 2013.
Ohio Department of Highways (1969). Official Highway Map(PDF) (Map). c. 1:563,200. Columbus: Ohio Department of Highways. OCLC5673562, 7448779. Retrieved October 1, 2013.
Ohio Department of Highways (1971). Official Highway Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Highways. OCLC5673562. Retrieved October 1, 2013.
Ohio Department of Transportation (1973). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562. Retrieved October 1, 2013.
Ohio Department of Transportation (1974). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562. Retrieved October 1, 2013.
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Ohio Department of Highways and Public Works (August 1, 1926). Map of Ohio Showing State Routes(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways and Public Works. OCLC5673562. Retrieved October 1, 2013.
Ohio Department of Highways and Public Works (June 1, 1927). Map of Ohio Showing State Routes(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways and Public Works. OCLC5673562. Retrieved October 1, 2013.
Ohio Department of Highways (1971). Official Highway Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Highways. OCLC5673562. Retrieved October 1, 2013.
Ohio Department of Transportation (1973). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562. Retrieved October 1, 2013.
Ohio Department of Transportation (1974). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562. Retrieved October 1, 2013.
worldcat.org
Ohio Department of Highways (1938). Ohio Official Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7453129. Retrieved October 1, 2013.
Ohio Department of Highways (1939). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7408341. Retrieved October 1, 2013.
Ohio Department of Highways (1969). Official Highway Map(PDF) (Map). c. 1:563,200. Columbus: Ohio Department of Highways. OCLC5673562, 7448779. Retrieved October 1, 2013.