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Start Over Year 1941 File Format JPEG2000 Bounding Box -40.000931 39.999015 -39.999064 40.000987

1. Illinois-Iowa, Keithsburg quadrangle

Maps University Of Illinois Urbana Champaign Public content
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.).

2. Iowa-Illinois Miles quadrangle

Maps University Of Illinois Urbana Champaign Public content
1941. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1935.";Relief shown by contours and spot heights.;Shows roadway classification as of 1940.;1 map, colored;45... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

3. Missouri-Illinois, Charleston quadrangle : grid zone 'C'

Maps University Of Illinois Urbana Champaign Public content
1941. Geological Survey (U.S.). Contour interval 5 feet.;"Topography by Corps of Engineers...1930-39. Revised...1932, 1935 and 1939.";Relief shown by contours and spot heights.;1 ... U.S. Army, War College.

4. Missouri-Illinois-Kentucky, Wickliffe quadrangle : grid zone 'C'

Maps University Of Illinois Urbana Champaign Public content
1941. Geological Survey (U.S.). Contour interval 5 feet.;"Topography by Corps of Engineers...1930-39. Revised by Mississippi River Commission, 1932, 1935 and 1939.";Relief shown b... Army Map Service (U.S.).