@article{102766,
      url = {http://digitallibrary.un.org/record/102766},
      title = {Efficiency and rational application of various methods and  techniques of water drainage in opencast mining :  questionnaire /},
      publisher = {UN,},
      recid = {102766},
      pages = {2 p.},
      address = {Geneva :. 1984-01-24},
      year = {1984},
      month = {Jan},
}