Geospatial Data - 25 of 31
Geospatial Data FAQs - 31 Found
A USGS DRG is a scanned image of a U.S. Geological Survey (USGS) topographic map. The term refers to products created in the period 1995-2000 that conform to a specific technical standard. This product series is now inactive, replaced by the larger and more comprehensive Historical Topographic Map Collection.
Information about the old DRGs is still posted here, but this web site is unmaintained and is for historical reference only.