@misc{indiciaea5c22825a90b,
  title = {Towards a biological survey of the U.S. National Parks System},
  author = {M. Ruggiero and T.J. Stohlgren and G. Waggoner},
  year = {1992},
  url = {https://pubs.usgs.gov/publication/70126956},
  note = {Source identifier: 70126956}
}