http://www.twohikers.org/westernmtns/PrinceWmSound01/pws2001_day3.htm
DRG or Digital Raster Graphic maps are digital images that are scanned onto a USGS topographic map so that the map can be used on the computer. They can depict different elevations, water systems, and other natural and man-made features. This map shows different campsites at Prince William's Sound in Europe.
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