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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
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  3. 3

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

    Published 1974
    Book
  4. 4

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

    Published 1973
    Map
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