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Start Over Year 1940 Place Iowa Bounding Box -86.51116 39.149274 -86.508949 39.150938

1. Iowa-Illinois, Burlington quadrangle : topography

University Of Illinois Urbana Champaign Public content
1940. Geological Survey (U.S.). Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.;"Surveyed in 1934.";Relief shown by contours and spot ... Geological Survey (U.S.)|Geological Survey Division (Urbana, Ill.).

2. Iowa-Illinois, East Dubuque quadrangle

University Of Illinois Urbana Champaign Public content
1940. Geological Survey (U.S.). Surveyed in 1935;Contour interval 20 feet.;Relief shown by contours and spot heights.;1 map, colored;46 x 34 cm.;1:62,500. Geological Survey (U.S.)|Geological Survey Division (Urbana, Ill.).