1926. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921 and 1924";Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1947. Geological Survey (U.S.). Mapped by the Geological Survey, 1944;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.).
1936. Geological Survey (U.S.). Contour interval 10 feet;"Surveyed in 1931-1932";(W 88⁰00ʹ00ʺ--W 87⁰45ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ);Relief shown by contours and spot heights.;Sho... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill).
1936. 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 1928 and 1931-1... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1946. Geological Survey (U.S.). Contour interval 20 feet.;"Mapped by the Geological Survey, 1922 and 1942-1944";Relief shown by contours and spot heights.;1 map, colored;45 x 35 c... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1925. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1922-1923.";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.).
1905. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1889-90, and [18]99.";Relief shown by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1958. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1922-1923";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey Division (Urbana, Ill.) and U.S. Geological Survey (U.S.).
1958. Geological Survey (U.S.). Contour interval 20 feet.;"Mapped by the Geological Survey 1928, 1935 and 1942";Relief shown by contours and spot heights.;1 map, colored;45 x 35 c... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1907. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1905.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;... Geological Survey (U.S.) and State Survey (Urbana, Ill.).