@article{229690,
      author = {Tysdal, Russell G.},
      url = {http://library.usi.edu/record/229690},
      title = {Depositional environments for strata of composite section  of Frontier Formation, Madison Range, southwestern Montana  /},
      publisher = {U.S. G.P.O. ;},
      recid = {229690},
      pages = {iv, 23 p. :},
      address = {Washington, D.C. :},
      year = {1991},
}