@article{32354,
      url = {http://digitallibrary.un.org/record/32354},
      title = {Drivage development and support of roadways and faces in  deep mines - 750 metres and over - and consequently in more  difficult mining, geological and atmospheric conditions /},
      publisher = {UN,},
      recid = {32354},
      pages = {17 p. :},
      address = {Geneva :. 1981-11-06},
      year = {1981},
      month = {Nov},
}