1932. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1924, 1927, and 1929.";Relief shown by contours and spot heights.;Road classification as of 1931.;1 map, col... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1960. Geological Survey (U.S.). Relief shown by contours and spot heights.;"Surveyed in 1921, 1926, 1928, and 1934";Contour interval 10 feet.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1925. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1923.";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.).
1916. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1913.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma... Geological Survey (U.S.) and State Geological Survey (Urbana, Ill.).
1892. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1890.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1937. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.";Relief shown by contours a... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1931. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1926, 1927, and 1928";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1893. Geological Survey (U.S.). Surveyed in 1891.;Relief indicated by contours.;Contour interval 10 feet.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1943. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1936 and 1937, Culture revised in part, 1942";Relief shown by contours and spot heights.;1 map, colored;45 x... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1915.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).