@article{229424,
      recid = {229424},
      author = {Epis, Rudy C., and Chapin, Charles E.},
      title = {Stratigraphic nomenclature of the Thirtynine Mile volcanic  field, central Colorado /},
      publisher = {U.S. Govt. Print. Off.,},
      address = {Washington :},
      pages = {iii, 23 p. :},
      year = {1974},
      url = {http://library.usi.edu/record/229424},
}