United States. Post Office Dept. "Post route map of the state of Iowa showing post offices with the intermediate distances on mail routes in operation on the 1st of December, 1903." Map. Washington, D.C.: Post Office Dept., 1903. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:cj82km695 (accessed April 16, 2024).