1944. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1936 and 1937.";Relief shown by contours.;Shows roadway classification as of 1943.;1 map, colored;45 x 35 cm... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1943. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1941.";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.).
10203. Illinois, Normal quadrangle.
1930. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1925-1926.";Relief shown by contours and spot heights.;Shows roadway classification as of 1929.;1 map, color... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1942. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.";"Surveyed in 1922, 1935 an... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1910. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1908.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;... Geological Survey (U.S.) and State Geological Survey (Urbana, Ill.).
10206. Illinois, Oregon quadrangle.
1924. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921-1922"; (W 89⁰30ʹ00ʺ--W 89⁰15ʹ00ʺ/N 42⁰15ʹ00ʺ--N 42⁰00ʹ00ʺ);Relief shown by contours and spot heights.;1... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
10207. Illinois, Orion quadrangle.
1937. 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 1930-1932";Re... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
10208. Illinois, Ottawa sheet.
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.).
1905. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1902-1904.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1938. Geological Survey (U.S.). Shows roadway classification as of 1937.;"Contour interval 10 feet";"Surveyed in 1922, 1928, and 1933";"Culture and drainage in part complied from ... Geological Survey (U.S.).