@article{240754,
      note = {Cover title.},
      author = {Menzie, W. D. and Singer, D. A.},
      url = {http://library.usi.edu/record/240754},
      title = {Grade and tonnage model of Porphyry Cu deposits in British  Columbia, Canada, and Alaska, U.S.A. [microform] /},
      publisher = {U.S. Geological Survey,},
      recid = {240754},
      pages = {[8] leaves :},
      address = {Reston, VA :},
      year = {1993},
}