@article{102339,
      url = {http://digitallibrary.un.org/record/102339},
      title = {Preparation of a subclassification of medium-rank coals :  proposals concerning the preparation of a "classification  of coals based on genetic and technological parameters" /},
      publisher = {UN,},
      recid = {102339},
      pages = {5 p. :},
      address = {Geneva :. 1983-02-04},
      year = {1983},
      month = {Feb},
}