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  1. 1

    Niobium and tantalum in the United States : exclusive of Alaska and Hawaii / by Parker, Raymond L. (Raymond Laurence)

    Published 1963
    Government Document Map
  2. 2

    Niobium (columbium) and tantalum in Canada / by Dawson, K. R.

    Published 1974
    Book
  3. 3

    Niobium and tantalum in Canada : mineral deposits map / by Dawson, K. R.

    Published 1973
    Map
  4. 4

    Columbium / by Stipp, Henry E.

    Published 1978
    Search for the full-text version of this title in HathiTrust
    Government Document Book
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  14. 14

    Alkaline rocks and niobium deposits near Nemegos, Ontario. by Hodder, R. W.

    Published 1961
    Book
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