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Joseph Davis' Map Catalog
Wednesday, December 2, 2009
DRG
A DRG digital raster graphic, is a scanned and georectofied image of the paper version of the U.S. Geological Survey topographic maps.
http://www.tceq.state.tx.us/assets/public/gis/images/drg.gif
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A DRG digital raster graphic, is a scanned and georectofied image of the paper version of the U.S. Geological Survey topographic maps. 
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