Calumet and Hecla Consolidated Copper Company Geological Division
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Calumet and Hecla Consolidated Copper Company Geological Division
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Calumet and Hecla Consolidated Copper Company Geological Division
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"The Copper Deposits of Michigan," also known as professional paper 144, was a geological survey of the copper mines in Michigan, including maps, tables, and diagrams. Published in 1926 with contributions by Calumet & Hecla Consolidated Mining Company.
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Copper
Copper mines and mining
Diamond bits
Drilling and boring
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Michigan--Upper Peninsula
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Upper Peninsula (Mich.)
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