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Methane in California gold mines
Mining and milling practices at small gold mines
Power-shovel and dragline placer mining
Guide to prospecting for lode gold
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Published Year
1920-1929 (1)
1930-1939 (2)
1950-1959 (1)
Subject
Gold mines and mining (4) *
Firedamp (1)
Gas bursts (1)
Gold mines and mining--California (1)
Methane (1)
Mine gases (1)
Mine gases--Flammability (1)
Mine gases--Measurement (1)
Mine ventilation (1)
Placer deposits (1)
Prospecting (1)
Author
Gardner, E. D. (4) *
Allsman, Paul Trekell, (1)
Clawson, Marion. (1)
Johnson, Charles H., (1)
Pickard, Byron O., (1)
