Iowa Department of Transportation (2010). State of Iowa Transportation Map(PDF) (Map). Ames: Iowa Department of Transportation. Retrieved November 21, 2010.
Minnesota Department of Highways (1965). Official Road Map Minnesota (Map). 1:792,000. St. Paul: Minnesota Department of Highways. §§ J20–K21. OCLC5673160, 80405240, 663975081. Retrieved January 25, 2010 – via Minnesota Digital Library.
Minnesota Department of Highways (1966). Official Road Map Minnesota (Map). 1:792,000. St. Paul: Minnesota Department of Highways. §§ J20–K21. OCLC5673160, 80405240, 243533967. Retrieved January 25, 2010 – via Minnesota Digital Library.
Minnesota Department of Highways (1965). Official Road Map Minnesota (Map). 1:792,000. St. Paul: Minnesota Department of Highways. §§ J20–K21. OCLC5673160, 80405240, 663975081. Retrieved January 25, 2010 – via Minnesota Digital Library.
Minnesota Department of Highways (1966). Official Road Map Minnesota (Map). 1:792,000. St. Paul: Minnesota Department of Highways. §§ J20–K21. OCLC5673160, 80405240, 243533967. Retrieved January 25, 2010 – via Minnesota Digital Library.