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 13, 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 October 13, 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 13, 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 October 13, 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 13, 2013.