File Winona Copper Company, 1900-1914 Box 3, F 25 In: Michigan Mining Industries Collection, 1845-1990 » Michigan Mining Industries Collection
File Wolverine Copper Mining Company, 1891-1923 Box 3, F 26 In: Michigan Mining Industries Collection, 1845-1990 » Michigan Mining Industries Collection
File Wyandot Copper Company, 1908 Box 3, F 27 In: Michigan Mining Industries Collection, 1845-1990 » Michigan Mining Industries Collection