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Mining of Mercedes orebody, Macuchi, Ecuador, South America
Tractors speed placer development in Alaska
Saga of comstock lode, boom days in Virginia City
Air-transportation of gold dredges in new Guinea
Air-transportation of gold dredges in new Guinea
Air-transportation of gold dredges in new Guinea
Air-transportation of gold dredges in new Guinea
Big wonder syndicate's Auriferous lodes
Possibilities of the Mother Lode in depth
Lodes in the tertiary eruptions of Colorado