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.)|Geological Survey Division (Urbana, Ill.).
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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.)|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.)|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.)|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.)|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.)|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.)|Geological Survey Division (Urbana, Ill.).