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9.

Illinois-Indiana, Carmi quadrangle : 15-minute series university-of-illinois-urbana-champaign

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....

10.

Illinois-Indiana, Watseka quadrangle university-of-illinois-urbana-champaign

1939. Geological Survey (U.S.). Shows roadway classification as of 1938.;"Contour interval 10 feet.";"Surveyed in 1934-1935.";Relief shown by contours and spot heights.;1 map, col...