United States. Post Office Dept. "Post route map of the states of Ohio and Indiana with adjacent parts of Pennsylvania, Michigan, Illinois, Kentucky and West Virginia, showing post offices with the intermediate distances and mail routes in operation on the 1st of October 1891." Map. Washington, D.C.: The Dept., 1891. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:cj82kk044 (accessed April 25, 2024).