@article{232228,
      author = {Smedes, Harry W. and Prostka, Harold J.,},
      url = {http://library.usi.edu/record/232228},
      title = {Stratigraphic framework of the Absaroka volcanic  supergroup in the Yellowstone National Park region,},
      publisher = {U.S. Govt. Print. Off.,},
      recid = {232228},
      pages = {v, 33 p. :},
      address = {Washington,},
      year = {1972},
}