@article{102338,
      url = {http://digitallibrary.un.org/record/102338},
      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 = {102338},
      pages = {23 p. :},
      address = {Geneva :. 1983-02-18},
      year = {1983},
      month = {Feb},
}