Michigan Department of Transportation (April 23, 2006). National Highway System, Michigan(PDF) (Map). Scale not given. Lansing: Michigan Department of Transportation. Archived from the original(PDF) on October 4, 2012. Retrieved October 7, 2008.
Staff (December 8, 2010). "Interactive Heritage Route Listing". Highway Programs. Michigan Department of Transportation. Retrieved February 8, 2011.
Michigan State Highway Department (1958). Official Highway Map (Map). [c. 1:918,720]. Lansing: Michigan State Highway Department. § I9. OCLC12701120, 51856742. Retrieved October 17, 2019 – via Michigan History Center. (Includes all changes through July 1, 1958)
Michigan State Highway Department (1960). Official Highway Map (Map). [c. 1:918,720]. Lansing: Michigan State Highway Department. § I9. OCLC12701120, 81552576. Retrieved October 17, 2019 – via Michigan History Center. (Includes all changes through July 1, 1960)
Michigan State Highway Department (1961). Official Highway Map (Map). [c. 1:918,720]. Lansing: Michigan State Highway Department. § I9. OCLC12701120, 51857665. Retrieved October 17, 2019 – via Michigan History Center. (Includes all changes through July 1, 1961)
Michigan State Highway Department (1962). Official Highway Map (Map). [c. 1:918,720]. Lansing: Michigan State Highway Department. § I9. OCLC12701120, 173191490. Retrieved October 17, 2019 – via Michigan History Center.
Michigan Department of Transportation (1999). Michigan Department of Transportation Map (Map). c. 1:918,720. Lansing: Michigan Department of Transportation. §§ L9–L10. OCLC42778335, 55974644. Retrieved October 17, 2019 – via Michigan History Center.
Michigan Department of Transportation (April 23, 2006). National Highway System, Michigan(PDF) (Map). Scale not given. Lansing: Michigan Department of Transportation. Archived from the original(PDF) on October 4, 2012. Retrieved October 7, 2008.
Michigan Department of Transportation (2010). Uniquely Michigan: Official Department of Transportation Map (Map). c. 1:975,000. Lansing: Michigan Department of Transportation. § L9. OCLC42778335, 639960603.
Michigan State Highway Department (1958). Official Highway Map (Map). [c. 1:918,720]. Lansing: Michigan State Highway Department. § I9. OCLC12701120, 51856742. Retrieved October 17, 2019 – via Michigan History Center. (Includes all changes through July 1, 1958)
Michigan State Highway Department (1960). Official Highway Map (Map). [c. 1:918,720]. Lansing: Michigan State Highway Department. § I9. OCLC12701120, 81552576. Retrieved October 17, 2019 – via Michigan History Center. (Includes all changes through July 1, 1960)
Michigan State Highway Department (1961). Official Highway Map (Map). [c. 1:918,720]. Lansing: Michigan State Highway Department. § I9. OCLC12701120, 51857665. Retrieved October 17, 2019 – via Michigan History Center. (Includes all changes through July 1, 1961)
Michigan State Highway Department (1962). Official Highway Map (Map). [c. 1:918,720]. Lansing: Michigan State Highway Department. § I9. OCLC12701120, 173191490. Retrieved October 17, 2019 – via Michigan History Center.
Michigan Department of Transportation (1999). Michigan Department of Transportation Map (Map). c. 1:918,720. Lansing: Michigan Department of Transportation. §§ L9–L10. OCLC42778335, 55974644. Retrieved October 17, 2019 – via Michigan History Center.
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Michigan State Highway Department & Rand McNally (December 1, 1935). Official Michigan Highway Map (Map). [c. 1:850,000]. Lansing: Michigan State Highway Department. § I9. OCLC12701143.