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Schaff and the staff of the Division of Mining and Geological and Geophysical Surveys (DMGGS), the map was reviewed and improved by R.B. Sanders (consulting geologist, Anchorage); G.D. Stricker (U.S. Geological Survey, Denver); P.D. Rao (University of Alaska Mineral Industry Research Laboratory, Fairbanks); S.E. Rawlinson and G.R. Eakins (DMGGS); D.M. Triplehorn (University of Alaska Department of Geology-Geophysics, Fairbanks); John F.M. Sims (Usibelli Coal Mine; Alaska Coal Association); Kurt Humphrey (Cook Inlet Region, Inc.); and Pio Park (Chugach Alaska Native Corporation). J.E. Callahan contributed information on the Northern Alaska province; J.V. Tucker (Diamond Alaska Coal Company), C.E. McFarland, and B.J.G. Patsch (Placer U.S. Inc.) reviewed the discussion of the Cook Inlet - Susitna province; and D.E. Germer (Rocky Mountain Energy) extensively revised the section on the Matanuska field. 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