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Start Over Author Geological Survey (U.S.) Year 1969 Bounding Box -40.000931 39.999015 -39.999064 40.000987

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

Maps University Of Illinois Urbana Champaign Public content
1969. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1950. Topography by plane-table surveys 1954."; (W 8... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

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