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.).
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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.).
1943. Geological Survey (U.S.). Relief shown by contours and spot heights.;Shows roadway classification as of 1942.;"Contour interval 20 feet";"Surveyed in 1909, 1922, 1936, 1937 ... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1927. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921-1922, and 1925.";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.).
1913. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1911.";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.).
1932. Geological Survey (U.S.). Contour interval 10 feet;"Surveyed in 1927-1928"; (W 89⁰30ʹ00ʺ--W 89⁰15ʹ00ʺ/N 40⁰45ʹ00ʺ--N 40⁰30ʹ00ʺ);Relief shown by contours and spot heights.;Sh... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1914. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;1 map, colored;45 x ... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1925. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1923.";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.).
1932. 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 1927";Relief s... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).