@article{101976,
      url = {http://digitallibrary.un.org/record/101976},
      title = {International classification of coal : comments on the  report /},
      publisher = {UN,},
      recid = {101976},
      pages = {3 p.},
      address = {Geneva :. 1984-04-13},
      year = {1984},
      month = {Apr},
}