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Hunting lost mines by helicopter.

GOLD Gardner, Erle Stanley MNG Hunting lost mines by helicopter. Morrow, 1965.
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Hardrock gold: a miner’s tale

GOLD Morrison, Tom MNG Hardrock gold: a miner’s tale. University of Oklahoma, 1992
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Placer gold recovery methods

GOLD Silva, Michael MNG Placer gold recovery methods. CA DMG, Spec. Pub. #87, 1986.
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Gold mines of California

GOLD Wagner, Jack R. MNG Gold mines of California. Howell-North, 1970
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