1949. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939. Topography by plane-table methods 1946.";Relie... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1957. Geological Survey (U.S.). Topography in Illinois from aerial photographs by Kelsh plotter, Aerial photographs taken 1956. Field check 1957, Topography in Indiana by planetab... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Indiana Dept. of Conservation (Indianapolis, Ind.).
1917. Geological Survey (U.S.). Surveyed in 1914.;"Surveyed in cooperation with the State of Illinois.";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.).
1943. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1921 and 1939-1940.";"Topography in Indiana from chart of the Wabash River by Corps of Engineers, U.S. Army.... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1938. Geological Survey (U.S.). Relief shown by contours and spot heights.;Contour interval 10 feet.;"Surveyed in 1931-1933.";Road classification as of 1937.;1 map, colored;45 x 3... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1924. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1922.";Relief shown by contours and spot heights.;1 map, colored;54 x 44 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1947. Geological Survey (U.S.). Contour interval 20 feet.;"Mapped by the Geological Survey 1945";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.).
1906. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1905.";"Surveyed in cooperation with the States of Illinois and Kentucky.";Relief shown by contours and spot... Geological Survey (Lexington, Ky.), Geological Survey (U.S.), and Geological Survey Division (Urbana, Ill.).
1949. Geological Survey (U.S.). Contour interval 10 feet;"Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods 1947.";Relief... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).