Calumet and Hecla Consolidated Copper Company Geological Division
"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.
From the description of Diamond Drill Reports, 1923-1925. (Michigan Technological University). WorldCat record id: 717316792
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