@article{102334,
      url = {http://digitallibrary.un.org/record/102334},
      title = {Technical progress in the mechanization of roadway drivage  in coal and stone ; increase in the share of roadways  driven by heading machines /},
      publisher = {UN,},
      recid = {102334},
      pages = {13, [3] p. :},
      address = {Geneva :. 1984-03-12},
      year = {1984},
      month = {Mar},
}