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USGS B 520

Placer mining in the Fortymile, Eagle, and Seventymile River districts

Bibliographic Reference

Porter, E.A., 1912, Placer mining in the Fortymile, Eagle, and Seventymile River districts, in U.S. Geological Survey, Mineral resources of Alaska, report on progress of investigations of 1911: U.S. Geological Survey Bulletin 520, p. 211-218.

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