@article{755140,
      url = {http://digitallibrary.un.org/record/755140},
      title = {Colombia : mineralizacion de tipo porfido cuprifero en el  area de el infierno, departamento del tolima : informe  técnico},
      publisher = {UN,},
      recid = {755140},
      pages = {132 p. :},
      address = {Bogota :. 1981},
      year = {1981},
}