@article{101979,
      url = {http://digitallibrary.un.org/record/101979},
      title = {Preparation of a new ECE classification of coals /},
      publisher = {UN,},
      recid = {101979},
      pages = {6 p. :},
      address = {Geneva :. 1983-08-09},
      year = {1983},
      month = {Aug},
}