Minnesota State Legislature (2010). "§ 161.114, Constitutional Trunk Highways". Minnesota Statutes. Minnesota Office of the Revisor of Statutes. Retrieved October 17, 2010.
mndigital.org
reflections.mndigital.org
Minnesota Highway Department; McGill-Warner (1923). Map of Trunk Highway System, State of Minnesota (Map). 1:760,320. St. Paul: Minnesota Highway Department. Retrieved December 16, 2018 – via Minnesota Digital Library. (Showing road conditions as of May 1, 1923)
Minnesota Highway Department; McGill-Warner (1929). Map of Trunk Highway System, State of Minnesota (Map). 1:760,320. St. Paul: Minnesota Highway Department. §§ E15–F12. OCLC5673160, 80405240. Retrieved December 16, 2018 – via Minnesota Digital Library. (Showing road conditions as of April 1, 1929)
Minnesota Highway Department; McGill-Warner (1934). Map of Trunk Highway System, State of Minnesota (Map). 1:760,320. St. Paul: Minnesota Highway Department. §§ D18–F12. OCLC5673160, 80405240. Retrieved December 16, 2018 – via Minnesota Digital Library. (Showing road conditions as of May 1, 1934)
Minnesota Highway Department; McGill-Warner (1936). Map of Trunk Highway System, State of Minnesota (Map). 1:760,320. St. Paul: Minnesota Highway Department. §§ E14–F12. OCLC5673160, 80405240. Retrieved December 16, 2018 – via Minnesota Digital Library. (Showing road conditions as of April 1, 1936)
Minnesota Highway Department; McGill-Warner (1929). Map of Trunk Highway System, State of Minnesota (Map). 1:760,320. St. Paul: Minnesota Highway Department. §§ E15–F12. OCLC5673160, 80405240. Retrieved December 16, 2018 – via Minnesota Digital Library. (Showing road conditions as of April 1, 1929)
Minnesota Highway Department; McGill-Warner (1934). Map of Trunk Highway System, State of Minnesota (Map). 1:760,320. St. Paul: Minnesota Highway Department. §§ D18–F12. OCLC5673160, 80405240. Retrieved December 16, 2018 – via Minnesota Digital Library. (Showing road conditions as of May 1, 1934)
Minnesota Highway Department; McGill-Warner (1936). Map of Trunk Highway System, State of Minnesota (Map). 1:760,320. St. Paul: Minnesota Highway Department. §§ E14–F12. OCLC5673160, 80405240. Retrieved December 16, 2018 – via Minnesota Digital Library. (Showing road conditions as of April 1, 1936)