MS-234, Upper Peninsula Section of the American Institute of Mining, Metallurgical and Petroleum Engineers Records, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan.
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MS-234, Upper Peninsula Section of the American Institute of Mining, Metallurgical and Petroleum Engineers Records, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan. https://michigantech.libraryhost.com/repositories/2/resources/121 Accessed November 22, 2024.
