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Start Over Year 1963 Format JPEG2000 Bounding Box -180 -89.81531 180 89.456192

1. Mason City quadrangle, Illinois : 15 minute series (topographic)

Maps University Of Illinois Urbana Champaign Public content
1963. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939-1940. Topography by plane-table methods 1947-19... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).