- Geological Survey (U.S.)
- University of Illinois at Urbana-Champaign, University Library
Relief shown by contours and spot heights.; "Mapped by the Geological Survey 1943-1944."; "Contour interval 10 feet. 45 x 35 cm.; 1 map, colored. 1:62,500. U.S. Geological Survey (Washington, D.C.); Geological Survey Division (Urbana, Ill.), 1946.
- Iroquois County , IL