@article{216777,
      note = {Cover title.},
      author = {Singer, D. A.},
      url = {http://library.usi.edu/record/216777},
      title = {Revised grade and tonnage model of carbonatite deposits  [microform] /},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey,},
      recid = {216777},
      pages = {7 leaves :},
      address = {Menlo Park, CA :},
      year = {1998},
}