@article{242467,
      note = {Prepared by Zygmunt Smolec.},
      author = {Smolec, Zygmunt},
      url = {http://digitallibrary.un.org/record/242467},
      title = {Clean coal technologies in Polish hard coal mining /},
      publisher = {UN,},
      recid = {242467},
      pages = {5 p. :},
      address = {Geneva :. 1997-08-18},
      year = {1997},
      month = {Aug},
}