1. County map of the State of Illinois. University Of Illinois Urbana Champaign Public content 1861. Mitchell, S. Augustus (Samuel Augustus), 1792-1868. Plan of Chicago.;Greenwich, Washington.;1 map, colored;33 x 25 cm.;ca. 1:2,100,000;published by S. Augustus Mitchell, Jr., 1864. -- Plate 38. S. Augustus Mitchell, Jr. (Philadelphia), c1861.