- Geological Survey (U.S.)
- University of Illinois at Urbana-Champaign, University Library
Relief shown by contours and spot heights.; "Surveyed in 1928-1929."; "Contour interval 10 feet."; Text and ill. on verso.; Shows highway classification as of 1932. 45 x 36 cm.; 1 map, colored. 1:62,500. Geological Survey (U.S.); Geological Survey Division (Urbana, Ill.).