- Geological Survey (U.S.)
- University of Illinois at Urbana-Champaign, University Library
Relief shown by contours and spot heights.; Contour interval 10 feet.; Lacks vegetation tint.; "Surveyed in 1930-1932."; Shows highway classification as of 1935. 45 x 35 cm.; 1 map, colored. 1:62,500. Geological Survey (U.S.); Geological Survey Division (Urbana Ill.).