MMetal-mining practiceMetal-mining practicede Charles Freeman JacksonMateriasMining engineeringEdiciones (1)Metal-mining practice (1939)U.S. Govt. print. off. · inglésMás obras de Charles Freeman JacksonSSmall-scale placer-mining methodsSmall-scale placer-mining methodsGGold mining and milling in the United States and CanadaGold mining and milling in the United States and CanadaLLead and zinc mining and milling in the United States
GGold mining and milling in the United States and CanadaGold mining and milling in the United States and Canada