Revised check-list of ferns and flowering plants of the Quetico-Superior Wilderness Research Center.

Eitemau Tebyg

• Breeding for resistance to white pine blister rust
  gan: Ahlgren, C. E. (Clifford Elmer), 1922-
  Cyhoeddwyd: (1968)
• The copper mines of lake Superior
  gan: Rickard, T. A. (Thomas Arthur), 1864-
  Cyhoeddwyd: (1905)
• Reports of Wm. A. Burt and Bela Hubbard, esqs., on the geography, topography and geology of the U.S. surveys of the mineral region of the south shore of Lake Superior, for 1845; accompanied by a list of working and organized mining companies; a list of mineral location, and a correct map of the mineral region also a chart of Lake Superior, reduced from the British admiralty survey
  gan: Houghton, J. (Jacob), Jr., 1827-1903
  Cyhoeddwyd: (1846)
• Swineford's history of the Lake Superior iron district, its mines and furnaces
  gan: Swineford, A. P. (Alfred P.), 1834-1909
  Cyhoeddwyd: (1871)
• History and review of copper, iron, silver, slate and other material interests of the south shore of Lake Superior
  gan: Swineford, A. P. (Alfred P.), 1834-1909
  Cyhoeddwyd: (1876)