MTU-207, Wilfrid C. Polkinghorne Collections, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan.
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MTU-207, Wilfrid C. Polkinghorne Collections, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan. https://michigantech.libraryhost.com/repositories/2/resources/823 Accessed November 22, 2024.