1913. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed 1909 and 1911.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot hei... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1941. Geological Survey (U.S.). Contour intervals 10 and 20 feet changing on the 580 foot contour.;"Culture and drainage in part compiled from aerial photographs taken by Air Corp... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1937. 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 1931-1932";Reli... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1940. Geological Survey (U.S.). Contour intervals 10 and 20 feet changing on the 580 foot contour.;"Culture and drainage in part compiled from aerial photographs taken by Air Corp... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1936. Geological Survey (U.S.). Contour intervals 10 and 20 feet changing on the 500 foot contour;"Culture and drainage in part compiled from aerial photographs taken by Air Corps... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1933. Geological Survey (U.S.). Contour interval 5 and 20 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.";"Missouri part surve... Bureau of Mineral and Topographic Survey (Lexington, Ky.), Geological Survey (U.S.), and Geological Survey Division (Urbana, Ill.).
1924. Geological Survey (U.S.). Surveyed in 1921 and 1922.;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.).
1934. Geological Survey (U.S.). Surveyed in 1922, 1924, 1925 and 1927.;Relief shown by contours and spot heights.;Road classification, 1932.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1931. Geological Survey (U.S.). Surveyed in 1921-1922 and 1928.;Relief shown by contours and spot heights.;Road classification, 1931.;1 map, colored;45 x 35 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 1915-1916.";"Surveyed in cooperation with the States of Illinois and Missouri."; (W 89⁰45ʹ00ʺ--W 89⁰30ʹ00ʺ/N... Geological Survey Division (Urbana, Ill.), State of Missouri Bureau of Geology and Mines (Rolla, Mo.), and Geological Survey (U.S.).