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.).
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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.).
1926. Geological Survey (U.S.). Relief shown by contours and spot heights.;"Control in part from railroad valuation surveys, Surveyed in 1924";Contour interval 10 feet.;1 map, col... Geological Survey Division (Urbana, Ill.) and Geological Survey (U.S.).
1936. Geological Survey (U.S.). Shows roadway classification as of 1935.; (W 89⁰30’00"--W 89⁰15’00"/N 42⁰30’00"--N 42⁰15’00");Contour interval 10 feet;Surveyed in 1915 and 1931-19... Geological Survey Division (Urbana, Ill.) and Geological Survey (U.S.).
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.).
1983. United States, Soil Conservation Service, and Geological Survey (U.S.). Extent: 1 map Notes: Includes notes and location map. Scale 1:100,000. Soil Conservation Service.