@article{1357251,
      author = {Patent, Dorothy Hinshaw. and Hartman, Dan, and Hartman,  Cassie,},
      url = {http://library.usi.edu/record/1357251},
      title = {When the wolves returned : restoring nature's balance in  Yellowstone /},
      publisher = {Walker :},
      abstract = {When wolves were eliminated from Yellowstone National Park  the natural system was out of balance. Shows the return of  the wolves to the park and the natural balance being  restored.},
      recid = {1357251},
      pages = {39 pages :},
      address = {New York :},
      year = {2008},
}