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Lead and zinc mining and milling in the United States :current practices and costs
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Published Year
1930-1939 (1)
Subject
Lead mines and mining--United States (1)
Ore-dressing (1)
Zinc mines and mining--United States (1) *
Author
Jackson, Charles Freeman, (1)
Knaebel, John Ballantine, (1)
Wright, Chilton Austin, (1)