GMNA North – ZIP (50 MB) | JPEG (27 MB)
GMNA Legend – PDF (32 MB) | JPEG (5 MB)
GMNA South – ZIP (50 MB) | JPEG (27 MB)
Information about how the map and database were prepared, the history of the source map, database contents, and the sources used to compile them.
The GMNA was converted to a GIS database and published as USGS DS-424 in 2009. A variety of GIS-ready products are available for download.
Learn more about USGS DS-424Shapefiles – ZIP (120 MB)
Metadata – XML (320 KB)
Geodatabase – ZIP (72 MB)
Google Earth – North (56 MB) | South (56 MB)
Questions or comments about the GMNA or map database? Contact the authors here.
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