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 September 27, 2013.
Ohio Department of Highways and Public Works (August 1924). Map of Ohio Showing State Routes(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways and Public Works. Retrieved September 27, 2013.
Ohio Department of Highways and Public Works (August 1925). Map of Ohio Showing State Routes(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways and Public Works. OCLC5673562. Retrieved September 27, 2013.
Ohio Department of Highways (1955). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7448742. Retrieved September 27, 2013.
Ohio Department of Highways (1957). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7444259. Retrieved September 27, 2013.
worldcat.org
Ohio Department of Highways and Public Works (August 1925). Map of Ohio Showing State Routes(PDF) (Map). 1:760,320. Columbus: Ohio Department of Highways and Public Works. OCLC5673562. Retrieved September 27, 2013.
Ohio Department of Highways (1955). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7448742. Retrieved September 27, 2013.
Ohio Department of Highways (1957). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7444259. Retrieved September 27, 2013.