@article{102778,
      url = {http://digitallibrary.un.org/record/102778},
      title = {Coal exploration and mine design with a view to an  efficient exploitation of coal and other associated raw  materials by the opencast method, particularly in difficult  mining and geological conditions /},
      publisher = {UN,},
      recid = {102778},
      pages = {4 p. :},
      address = {Geneva :. 1984-09-21},
      year = {1984},
      month = {Sep},
}