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2015. U.S. Geological Survey (USGS) and Minnesota Department of Natural Resources (DNR). Bounding box of state area and static image in references. A digital raster graphic (DRG) is a scanned image of an U.S. Geological Survey (USGS) s... Minnesota Department of Natural Resources (DNR).
1998. U.S. Geological Survey and Minnesota DNR. Bounding box of state area and raster download. A digital raster graphic (DRG) is a scanned image of an U.S. Geological Survey (USGS) standard ser... Minnesota Department of Natural Resources (DNR).