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GEOLOGIC MAP OF THE KETCHIKAN AND PRINCE RUPERT QUADRANGLES, ALASKA
Berg, H. C., Elliott, R. L., Smith, J. G., and Koch, R. L., 1978, Geologic map of the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File report 78-0073A, unpaged, 1 sheet, scale 1:250,000. full-text pdf : 2.5 MB sheet 1 : 2.3 MB