DRG's are scanned images of USGS topographical maps. This is done so manipulations and other layers may be added to boost the image or present more information. This is a DRG of the Texas State School for the deaf and the area surrounding.http://www.tceq.state.tx.us/assets/public/gis/images/drg.gif
http://www.tceq.state.tx.us/assets/public/gis/images/drg.gif
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