MS-899, Letter from War Department, United States Engineer Office, Sault Ste. Marie, Michigan, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan.
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MS-899, Letter from War Department, United States Engineer Office, Sault Ste. Marie, Michigan, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan. https://michigantech.libraryhost.com/repositories/2/resources/562 Accessed January 31, 2025.
