MS-972, Commercial Statistics and Marine Commerce through Portage lake Ship Canals, Lake Superior, Michigan Collection, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan.
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MS-972, Commercial Statistics and Marine Commerce through Portage lake Ship Canals, Lake Superior, Michigan Collection, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan. https://michigantech.libraryhost.com/repositories/2/resources/865 Accessed January 31, 2025.
