1. Chapman's township map of the northwest : compiled from the United States surveys and other authentic sources. Maps University Of Illinois Urbana Champaign Public content 1857. Chapman, Silas. ca. 1:1,500,000. (Ferd. Mayer & Co. (New York)), A.S. Barnes & Co. (New York), Dyer & Pasmore (Milwaukee, Wisconsin), and J.B. Lippincott & Co. (Philadelphia).