@article{7545,
      author = {Keefer, William R.,},
      url = {http://library.usi.edu/record/7545},
      title = {The Geologic story of Yellowstone National Park,},
      publisher = {For sale by the Supt. of Docs., U.S. Govt. Print. Off.,},
      recid = {7545},
      pages = {xii, 92 p.},
      address = {[Washington;},
      year = {1971},
}