1911. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1909.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1923. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1920.";"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.).
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.).
1924. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1922.";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.).
1944. Geological Survey (U.S.). Surveyed in 1930 and 1942;Relief shown by contours and spot heights.;Contour interval 20 feet.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1917.";"Surveyed in cooperation with the War Department and the State of Illinois.";Relief shown by contours... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and War Dept., Corps of Engineers, U.S. Army (U.S.).
1947. Geological Survey (U.S.). Contour interval 20 feet.;"Mapped by the Geological Survey, 1945.";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.).
1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1917.";"Surveyed in cooperation with the War Department and the State of Illinois.";Relief shown by contours... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and War Dept., Corps of Engineers, U.S. Army (U.S.).
1943. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1930 and 1941";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.).
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 (U.S.) and Geological Survey Division (Urbana, Ill.).