MS-045, Calumet and Hecla Mining Companies Geological Map Collection, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan.
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MS-045, Calumet and Hecla Mining Companies Geological Map Collection, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan. https://michigantech.libraryhost.com/repositories/2/resources/41 Accessed November 21, 2024.