MS-711, Red Metal: The Calumet and Hecla Story Manuscript, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan.
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MS-711, Red Metal: The Calumet and Hecla Story Manuscript, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan. https://michigantech.libraryhost.com/repositories/2/resources/377 Accessed November 23, 2024.