Digital Raster Graphics
Digital Raster Graphics are scanned and georeferenced USGS Quadrangles. They are made up of two files-- a .tif and a .tfw. The .tif files contain the image data, and the .tfw contains georeferencing data. both of these files need to be downloaded to work properly with some software packages. A third file, .prj defines the projection for use with ArcGis iv 8.x These images are georeferenced to the UTM Zone 17, NAD83 datum.
Download by quadrangle name

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