@article{102420,
      url = {http://digitallibrary.un.org/record/102420},
      title = {Drivage, development and support of roadways and faces in  deep mines - 1,000 metres and over - and consequently in  more difficult mining, geological and atmospheric  conditions /},
      publisher = {UN,},
      recid = {102420},
      pages = {4 p.},
      address = {Geneva :. 1983-11-28},
      year = {1983},
      month = {Nov},
}