- Geological Survey (U.S.)
- University of Illinois at Urbana-Champaign, University Library
Relief shown by contours.; "Contour interval 10 feet"; "Surveyed in 1889, 1897 and 1899. 45 x 34 cm.; 1 map, colored. 1:62,500. Geological Survey (U.S.).
Calumet Region (Ill. and Ind.)
Cook County (Ill.)
Lake County (Ind.)