@article{217430,
      note = {Cover title.},
      author = {Connor, Jon J. and Bartel, A. J.},
      url = {http://library.usi.edu/record/217430},
      title = {Geochemical variation in a copper-bearing redbed sequence  of the Ravalli Group (Belt Supergroup), northwestern  Montana and northern Idaho [microform] /},
      publisher = {U.S. Geological Survey :},
      recid = {217430},
      pages = {2 v. :},
      address = {Denver, Colo. :},
      year = {1991},
}