"A new digital geologic map of Alaska released January 5th provides land users, managers and scientists geologic information for the evaluation of land use "
More than 750 references were used in creating the map, some as old as 1908 and others as new as 2015
source:
http://www.usgs.gov/newsroom/article.asp?ID=4430#.Vow6pvkrKUk
Link to map (pdf)
http://pubs.usgs.gov/sim/3340/sim3340_sheet1.pdf
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