@article{102777,
      url = {http://digitallibrary.un.org/record/102777},
      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 = {102777},
      pages = {9 p.},
      address = {Geneva :. 1984-03-15},
      year = {1984},
      month = {Mar},
}