MTU-249, ASCE National Historic Civil Engineering Landmark Award Nomination Package for the Portage Lake Bridge, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan.
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MTU-249, ASCE National Historic Civil Engineering Landmark Award Nomination Package for the Portage Lake Bridge, Michigan Technological University Archives and Copper Country Historical Collections, Houghton, Michigan. https://michigantech.libraryhost.com/repositories/2/resources/938 Accessed November 21, 2024.
