1923. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1918 and 1921";Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;1:62,500. Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and State of Missouri Bureau of Geology and Mines (Rolla, Mo.).
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1930. Geological Survey (U.S.). Contour interval 20 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.";"Surveyed in 1926-1927.";R... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1930. Geological Survey (U.S.). Contour interval 20 feet;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surveyed in 1926-1927";Reli... 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.).
1943. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1911 and 1913. Culture revised in part, 1940";"Surveyed in cooperation with the States of Illinois and Misso... Bureau of Geology and Mines (Rolla, Mo.), Geological Survey (U.S.), and Geological Survey Division (Urbana, Ill.).
1934. Geological Survey (U.S.). 1 map, colored;Contour intervals 5 and 20 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surv... War Dept., Corps of Engineers, U.S. Army (U.S.), Geological Survey Division (Urbana, Ill.), and Geological Survey (U.S.).
1908. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1906.";"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.).
1918. Geological Survey (U.S.). Surveyed in 1917.;Surveyed in cooperation with the War Department and the State of Illinois.";Relief shown by contours and spot heights.;1 map, col... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1923. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1919-1920.";"Surveyed in cooperation with the States of Illinois and Wisconsin.";Relief shown by contours an... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Geological and Natural History Survey (Madison, Wis.).
1937. Geological Survey (U.S.). Surveyed in 1932.;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.).