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.).
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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.).
1940. Geological Survey (U.S.). Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.;"Surveyed in 1934.";Relief shown by contours and spot ... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1940. Geological Survey (U.S.). Surveyed in 1935;Contour interval 20 feet.;Relief shown by contours and spot heights.;1 map, colored;46 x 34 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1936. 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 1928 and 1933... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1941. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1935.";Relief shown by contours and spot heights.;Shows roadway classification as of 1940.;1 map, colored;45... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1948. Geological Survey (U.S.). Contour interval 20 feet.;"Mapped by the Geological Survey 1946"; (W 91⁰15ʹ00ʺ--W 91⁰00ʹ00ʺ/N 41⁰30ʹ00ʺ--N 41⁰15ʹ00ʺ);Relief shown by contours and... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).