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  1. 1

    Economía minera / by Hoover, Theodore Jesse 1871-1955

    Published 1946
    Book
  2. 2

    Principios de economía minera / by Ballivian Calderón, René

    Published 1961
    Book
  3. 3

    BOLETIM. MINISTERIO DAS MINAS E ENERGIA.

    Published 1973
    Serial
  4. 4

    Economía minera / by Hoover, Thedore Jesse

    Published 1946
    Book
  5. 5

    Return on analysis and forecast in the Canadian mineral industry / by Malhotra, S. P.

    Published 1971
    Book