https://www.e-education.psu.edu/natureofgeoinfo/c6_p6.html
The DRG map is a Digital Raster Graphics. It is scanner raster images of USGA topographic maps. These types of maps are useful a backdrop for other data to be superimposed. This can be used to check the correctness of a vector file. This map is a DRG of the Depue Island.
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