@article{,
      note = {"This publication updates 'Part Two of the National Park  System plan - Natural History'"--P. 1.},
      url = {http://library.usi.edu/record/293722},
      title = {Natural history in the National Park System and on the  national registry of natural landmarks.},
      publisher = {National Park Service,},
      number = {NPS D-545},
      recid = {293722},
      pages = {i, 99 p., [1] folded leaf of plates :},
      address = {Washington, D.C. :},
      year = {1990},
}