05/19/2011 Directory: Data/BaseLayers/ This directory contains GIS data that show the boundaries of the 1:250,000 and 1:63,360 quadrangles of Alaska. Geophysical, Geochemical, and Mineralogical Data from the Pebble Cu-Au-Mo Porphyry Deposit Area, Southwest Alaska: Contributions to Assessment Techniques for Concealed Mineral Resources 2011 By E.D. Anderson, S.M. Smith, S.A. Giles, Matthew Granitto, R.G. Eppinger, P.A. Bedrosian, A.K. Shah, K.D. Kelley, D.L. Fey, B.J. Minsley, P.J. Brown