1925. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921 and 1923.";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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1910. Geological Survey (U.S.). Surveyed in 1908.;"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;1 map, colored;45 x 36 cm.;1... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1900. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1897.";Relief indicated 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.).
1925. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1923.";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.).
1921. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1914, 1916 and 1920.";"Surveyed in cooperation with the States of Kentucky and Illinois."; (W 88⁰30ʹ00ʺ--W 8... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Kentucky Geological Survey (Lexington, Ky.).
1952. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939 and 1941. Topography by plane-table surveys 195... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1953. Geological Survey (U.S.). Culture and drainage in part compiled from aerial photographs taken 1948. Topography by plane-table surveys, 1930 and 1951-1952. Includes quadrangl... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1953. Geological Survey (U.S.). Culture and drainage in part compiled from aerial photographs taken 1950. Topography by plane-table surveys 1945 and 1951-1952.;Includes quadrangle... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1949. Geological Survey (U.S.). Relief shown by contours and spot heights. "Topography by plane-table methods 1946.";1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1956. Geological Survey (U.S.). Culture and drainage in part compiled from aerial photographs taken 1946 and 1953. Topography by plane-table surveys 1954-1955.;Relief shown by con... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).