@article{258048,
      recid = {258048},
      author = {Singer, D. A. and Menzie, W. D. and Long, Keith R.},
      title = {A simplified economic filter for underground mining of  massive sulfide deposits [microform] /},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey,},
      address = {Menlo Park, CA :},
      pages = {20 leaves :},
      year = {2000},
      note = {Cover title.},
      url = {http://library.usi.edu/record/258048},
}