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 February 22, 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 February 22, 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 February 22, 2013.
Ohio Department of Highways (1940). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 54667346. Retrieved February 22, 2013.
Ohio Department of Highways (1941). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7408262. Retrieved February 22, 2013.
Ohio Department of Highways (1948). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7412169. Retrieved February 22, 2013.
Ohio Department of Highways (1949). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 13655762. Retrieved February 22, 2013.
Ohio Department of Highways (1964). Ohio Official Highway Map(PDF) (Map). c. 1:563,200. Columbus: Ohio Department of Highways. OCLC5673562, 7448791. Retrieved February 22, 2013.
Ohio Department of Transportation (1977). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562, 49061100. Retrieved February 22, 2013.
Ohio Department of Transportation (1978). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562, 13655727. Retrieved February 22, 2013.
Ohio Department of Transportation (1979). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562, 7302607. Retrieved February 22, 2013.
Ohio Department of Transportation (July 1997). Official Ohio Transportation Map(PDF) (Map) (1997–1998 ed.). c. 1:696,960. Columbus: Ohio Department of Transportation. OCLC5673562, 31884639. Retrieved February 22, 2013.
Ohio Department of Transportation (June 1999). Official Ohio Transportation Map(PDF) (Map) (1999–2000 ed.). c. 1:696,960. Columbus: Ohio Department of Transportation. OCLC5673562, 31884639. Retrieved February 22, 2013.
Ohio Department of Transportation (January 2003). Official Ohio Transportation Map(PDF) (Map) (2003–2004 ed.). c. 1:570,240. Columbus: Ohio Department of Transportation. OCLC5673562, 31884639. Retrieved February 22, 2013.
Ohio Department of Transportation (January 2007). Official Ohio Transportation Map (Map) (2007–2009 ed.). c. 1:570,240. Columbus: Ohio Department of Transportation. OCLC5673562, 31884639. Retrieved February 22, 2013.
Ohio Department of Highways (1940). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 54667346. Retrieved February 22, 2013.
Ohio Department of Highways (1941). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7408262. Retrieved February 22, 2013.
Ohio Department of Highways (1948). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 7412169. Retrieved February 22, 2013.
Ohio Department of Highways (1949). Ohio Highway Map(PDF) (Map). 1:633,600. Columbus: Ohio Department of Highways. OCLC5673562, 13655762. Retrieved February 22, 2013.
Ohio Department of Highways (1964). Ohio Official Highway Map(PDF) (Map). c. 1:563,200. Columbus: Ohio Department of Highways. OCLC5673562, 7448791. Retrieved February 22, 2013.
Ohio Department of Transportation (1977). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562, 49061100. Retrieved February 22, 2013.
Ohio Department of Transportation (1978). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562, 13655727. Retrieved February 22, 2013.
Ohio Department of Transportation (1979). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. OCLC5673562, 7302607. Retrieved February 22, 2013.
Ohio Department of Transportation (July 1997). Official Ohio Transportation Map(PDF) (Map) (1997–1998 ed.). c. 1:696,960. Columbus: Ohio Department of Transportation. OCLC5673562, 31884639. Retrieved February 22, 2013.
Ohio Department of Transportation (June 1999). Official Ohio Transportation Map(PDF) (Map) (1999–2000 ed.). c. 1:696,960. Columbus: Ohio Department of Transportation. OCLC5673562, 31884639. Retrieved February 22, 2013.
Ohio Department of Transportation (January 2003). Official Ohio Transportation Map(PDF) (Map) (2003–2004 ed.). c. 1:570,240. Columbus: Ohio Department of Transportation. OCLC5673562, 31884639. Retrieved February 22, 2013.
Ohio Department of Transportation (January 2007). Official Ohio Transportation Map (Map) (2007–2009 ed.). c. 1:570,240. Columbus: Ohio Department of Transportation. OCLC5673562, 31884639. Retrieved February 22, 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 February 22, 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 February 22, 2013.