Arkansas State Highway and Transportation Department (2015). "Arkansas Road Log Database". Arkansas State Highway and Transportation Department. Archived from the original(MDB) on August 29, 2017. Retrieved March 27, 2016.
Arkansas State Highway Commission (June 1, 1931). Official Highway Service Map(TIF) (Revised). Scale not given. Little Rock: Arkansas State Highway Commission. Retrieved December 9, 2020 – via Arkansas GIS Office.
Arkansas State Highway Commission (January 1, 1932). Official Highway Service Map(TIF) (Map). Scale not given. Little Rock: Arkansas State Highway Commission. Retrieved December 9, 2020 – via Arkansas GIS Office.
Arkansas State Highway Commission (April 1935). Map of the State Highway System of Arkansas(TIF) (Map). Scale not given. Little Rock: Arkansas State Highway Commission. Retrieved December 9, 2020 – via Arkansas GIS Office.
Arkansas State Highway Commission (1935). Official Highway Service Map(TIF) (Map). Scale not given. Little Rock: Arkansas State Highway Commission. Retrieved December 9, 2020 – via Arkansas GIS Office.
ksdot.org
ksdot.org
State Highway Commission of Kansas (1937). Kansas State Highway System(PDF) (Map). Scale not given. Topeka: State Highway Commission of Kansas. Retrieved February 28, 2021.
State Highway Commission of Kansas (1938). Kansas State Highway System(PDF) (Map). Scale not given. Topeka: State Highway Commission of Kansas. Retrieved February 28, 2021.
Arkansas State Highway and Transportation Department (2015). "Arkansas Road Log Database". Arkansas State Highway and Transportation Department. Archived from the original(MDB) on August 29, 2017. Retrieved March 27, 2016.
Special Committee on U.S. Route Numbering (November 14, 1980). "Route Numbering Committee Agenda"(PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 522 – via Wikimedia Commons.