1944. Geological Survey (U.S.). Road classification as of 1943.;Relief shown by contours and spot heights.;"Surveyed in 1930-1931 and 1940.";Contour interval 10 feet.;1 map, color... Geological Survey Division (Urbana, Ill.)|Geological Survey (U.S.).
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1929. Geological Survey (U.S.). Relief shown by contours and spot heights.;"Surveyed in 1925-1926.";Contour interval 20 feet;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey Division (Urbana, Ill.)|Geological Survey (U.S.).
1925. Geological Survey (U.S.). Relief shown by contours and spot heights.;"Surveyed in 1922-1923.";Contour interval 10 feet.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey Division (Urbana, Ill.)|Geological Survey (U.S.).
1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1916.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma... Geological Survey Division (Urbana, Ill.)|Geological Survey (U.S.).