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  1. 1
    Prehistoric copper mining in Michigan : the nineteenth-century discovery of "ancient diggings" in the Keweenaw Peninsula and Isle Royale /
    by Halsey, John R.
    Published 2018
    Texto completo
    Electronic eBook
  2. 2
    Prehistoric Copper Mining in Michigan : The Nineteenth-Century Discovery of "Ancient Diggings" in the Keweenaw Peninsula and Isle Royale /
    by Halsey, John R.
    Published 2018
    Texto completo
    Electronic eBook