DRG
http://www.tceq.state.tx.us/gis/drg.html
Digital Raster Graphics (DRGs) are scanned images of U.S. Geological Survey (USGS) topographic maps. The image represented inside the map neatline is georeferenced to the surface of the earth. This makes it possible to use DRG as a map layer in many GIS software packages.
Digital Raster Graphics (DRGs) are scanned images of U.S. Geological Survey (USGS) topographic maps. The image represented inside the map neatline is georeferenced to the surface of the earth. This makes it possible to use DRG as a map layer in many GIS software packages.
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