Illinois Secretary of State; H.M. Gousha (1935). Official Road Map Illinois (Map). [c. 1:950,000 and c. 1:1,110,000]. Springfield: Illinois Secretary of State. Retrieved November 5, 2020 – via Illinois Digital Archives.
Illinois Secretary of State; Rand McNally (1934). Official Road Map Illinois (Map). [c. 1:950,000 and c. 1:1,110,000]. Springfield: Illinois Secretary of State. OCLC183709045. Retrieved November 5, 2020 – via Illinois Digital Archives.
Illinois Technology Transfer Center (2007). "T2 GIS Data". Retrieved 2007-11-08.
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Illinois Secretary of State; Rand McNally (1934). Official Road Map Illinois (Map). [c. 1:950,000 and c. 1:1,110,000]. Springfield: Illinois Secretary of State. OCLC183709045. Retrieved November 5, 2020 – via Illinois Digital Archives.