@article{229672,
      author = {Coban, William Aubrey,},
      url = {http://library.usi.edu/record/229672},
      title = {Ammonites and some characteristic bivalves from the Upper  Cretaceous Frontier Formation, Natrona County, Wyoming /},
      publisher = {U.S. G.P.O. ;},
      recid = {229672},
      pages = {iv, 13 p., 11 p. of plates :},
      address = {Washington, D.C. :},
      year = {1990},
}