USGS Geologic Map of North America
Entry ID: USGS_GMNA

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Link: http://esp.cr.usgs.gov/info/gmna/comparisons1.html
Description: Comparisons of the 2005 Geologic Map of North America with the 1965 Map, Areas
1-4.
Link: http://esp.cr.usgs.gov/info/gmna/comparisons2.html
Description: Comparisons of the 2005 Geologic Map of North America with the 1965 Map, Areas
5-7.
Link: http://rock.geosociety.org/bookstore/default.asp?oID=0&catID=2&pID=...
Description: Order the Geologic Map of North America from the GSA bookstore.

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