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  1. 1
    Published 1978
    [Victoria, B.C.] : Ministry of Energy, Mines and Petroleum Resources, 1978-
    v. : ill. ; 27 cm.
  2. 2
    [Bogotá, Ministerio de Minas y Energía]
    v. ill. 28 cm.
  3. 3
    Published 1983
    Bogotá : El Ministerio, 1983-1984.
    2 v. : ill. ; 24 cm.

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