@article{102337,
      url = {http://digitallibrary.un.org/record/102337},
      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 = {102337},
      pages = {9 p.},
      address = {Geneva :. 1983-04-20},
      year = {1983},
      month = {Apr},
}