1945. Geological Survey (U.S.). Contour interval 10 feet.;Relief shown by contours and spot heights.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1945. Geological Survey (U.S.). Contour interval 20 feet.;Mapped by the Geological Survey 1930, 1940 and 1942.;Shows roadway classification as of 1945.;1 map, colored;45 x 34 cm.;... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1945. Geological Survey (U.S.). Contour interval 20 feet.;"Mapped by the Geological Survey 1942";Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1945. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1922 and 1940. Culture in Illinois partly revised in 1944";Relief shown by contours and spot heights.;1 map,... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).