- A DRG map is the original hard copy only, but now available in digital format as a DRG (digital raster graphic), a scanned and georectified image of the paper version).- This map is of Denver, Ogden in 1899. This type of map is more of the DRG type of maps I have seen, because to archive only paper, could cause age problems with the paper. To ensure a good archive going digital was the best option.
- ghostdepot.com/rg/maps/index%20map%20other.htm
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