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Start Over Year 1933 Publisher Bureau of Geology and Mines (Rolla, Mo.) Bounding Box -180 -89.81531 180 89.456192

1. Missouri-Illinois, St. Charles quadrangle

Maps University Of Illinois Urbana Champaign Public content
1933. Geological Survey (U.S.). Contour interval 20 feet;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surveyed in 1923 and 1927";... Bureau of Geology and Mines (Rolla, Mo.), Geological Survey (U.S.), and Geological Survey Division (Urbana, Ill.).