@article{263347,
      note = {Cover title.},
      author = {Sidder, Gary B.},
      url = {http://library.usi.edu/record/263347},
      title = {Mineral occurrences of the Guiana Shield, Venezuela  [microform] /},
      publisher = {U.S. Geological Survey,},
      recid = {263347},
      pages = {28 p. :},
      address = {[Denver, CO] :},
      year = {1990},
}