Chapman, Silasca. 1:1,500,000JPEG2000https://digital.library.illinois.edu/items/a02a3c00-994e-0134-2096-0050569601ca-4fre(Ferd. Mayer & Co. (New York))A.S. Barnes & Co. (New York)Dyer & Pasmore (Milwaukee, Wisconsin)J.B. Lippincott & Co. (Philadelphia)PublicChapman's township map of the northwest : compiled from the United States surveys and other authentic sources.MapsIllinoisIowaMinnesotaWisconsin1857University of Illinois Urbana-Champaign