of/1999/of99-422/norpac/data/geology/ak_geol/explanat
  Geologic map of alaska compiled by helen m. Beikman
of/1999/of99-422/norpac/data/terranes/alaska/Explanat
  U. S. Geological survey pamphlet introduction, tectonic definitions, acknowledgments
of/1999/of99-422/norpac/data/terranes/nor_pac/explanat
  U. S. Geological survey pamphlet circum-north pacific tectonostratigraphic terrane map
directory 1999 of99-422  




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