MS-005, Calumet and Hecla Mining Companies Drawings Collection, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan.
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MS-005, Calumet and Hecla Mining Companies Drawings Collection, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan. https://michigantech.libraryhost.com/repositories/2/resources/5 Accessed December 03, 2024.