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Geological Survey (U.S.). Illinois-Wisconsin, Grays Lake quadrangle : topography. [JPEG2000]. Geological Survey (U.S.). Geological Survey Division (Urbana, Ill.). Geological and Natural History Survey (Madison, Wis.). Retrieved from https://geo.nyu.edu/catalog/944efd00-82d4-0134-1f08-0050569601ca-7