Illinois Secretary of State; Rand McNally (1950). Illinois Road Map (Map). c. 1:918,720. Springfield: Illinois Secretary of State. Retrieved November 6, 2020 – via Illinois Digital Archives.
Illinois Secretary of State (1924). Illinois Official Auto Trails Map (Map). [c. 1:950,000 and c. 1:1,110,000]. Springfield: Illinois Secretary of State. Retrieved November 15, 2020 – via Illinois Digital Archives.
Illinois Secretary of State; Rand McNally (1939). Illinois Road Map (Map) (1939–1940 ed.). c. 1:918,720. Springfield: Illinois Secretary of State. Retrieved November 6, 2020 – via Illinois Digital Archives.
Illinois Secretary of State; Rand McNally (1948). Illinois Road Map (Map). c. 1:918,720. Springfield: Illinois Secretary of State. Retrieved November 6, 2020 – via Illinois Digital Archives.