GOLD Gardner, Erle Stanley MNG Hunting lost mines by helicopter. Morrow, 1965.
GOLD Morrison, Tom MNG Hardrock gold: a miner’s tale. University of Oklahoma, 1992
GOLD Silva, Michael MNG Placer gold recovery methods. CA DMG, Spec. Pub. #87, 1986.
GOLD Wagner, Jack R. MNG Gold mines of California. Howell-North, 1970