MS-952, Mary Ralph Erkkila and Annie Sullivan Ralph Family Papers, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan.
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MS-952, Mary Ralph Erkkila and Annie Sullivan Ralph Family Papers, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan. https://michigantech.libraryhost.com/repositories/2/resources/611 Accessed November 24, 2024.