1. Map of the state of Illinois. Maps University Of Illinois Urbana Champaign Public content 1866. United States. General Land Office. Shows lead and copper regions and 6 and 15 mile limits of land grant railroads.;1 map, colored;56 x 38 cm.;ca. 1:1,200,000. [s.l.] : General Land Office. (Phila[delphia] : Bowen & Co. lith.).