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RECONNAISSANCE GEOLOGIC MAP OF THE UNALAKLEET QUADRANGLE, ALASKA
Cass, J.T., 1959, Reconnaissance geologic map of the Unalakleet quadrangle, Alaska: US Geological Survey Miscellaneous Investigations 288, 1 sheet, scale 1:250,000, available at http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=13596 . DGGS site with citation and link to PDF