Map Catalog
Monday, July 23, 2012
DRG (Digital Raster Graphic)
http://egsc.usgs.gov/isb/pubs/factsheets/fs08801.html
A DRG, or digital raster graphic, is
a scanned image of a U.S. Geological
Survey topographic map. This DRG is of the Washington West, D.C.
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