a comprehensive treatise on the origin and occurrence of gold-bearing gravels, rocks, and ores, and the methods by which the gold is extracted.
By C. G. Warnford Lock ...
|Main Author:||Lock, Charles G. Warnford, 1853-1909.|
London, E. & F. N. Spon, 1889.
Gold mines and mining
xvi, 788 p.
front., illus., plates, diagrs.
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