United States. Post Office Dept. "Post route map of the State of Minnesota with adjacent parts of Iowa, Nebraska, Dakota, Wisconsin and of the British possessions, showing post offices with the intermediate distances and mail routes in operation on the 1st of October 1891." Map. Washington, D.C.: Post Office Dept., 1891. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:cj82kj87p (accessed April 23, 2024).