@article{244177,
      url = {http://digitallibrary.un.org/record/244177},
      title = {Reassessment of coal deposits under market-economy  conditions : draft proposal of a new Czech mineral  resources classification system /},
      publisher = {UN,},
      recid = {244177},
      pages = {6 p. :},
      address = {Geneva :. 1993-06-08},
      year = {1993},
      month = {Jun},
}