https://www.e-education.psu.edu/natureofgeoinfo/c6_p6.html
A digital raster graphic (DRG) is a scanned image of the U.S. Geological Survey (USGS) standard series topographic map. These maps include all map collar information. The map "neatline" is then geo-referenced to the surface of the Earth, and the DRG map is thus used to collect, review, and revise other digital data. Combining DRG maps with other types (DEMs, DOQQs, etc.) only helps, by providing additional visual cartographic information.
This DRG is a magnified portion of a separate DRG map of Bushkill, PA.
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