"Digital Raster Graphics (DRGs) are optically scanned map images originally produced by the US Geological Survey (USGS). This page describes DRGs for the State of Wisconsin as acquired from USGS and enhanced by DNR.
Wisconsin Geological and Natural History Survey (WGNHS) - purchase printed topographic maps at their Madison Map Sales Office or call (608) 263-7389
Monday, October 17, 2011
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