@misc{indiciae91ca65aeccf0,
  title = {Elk, beaver, and the persistence of willows in national parks: comment on Singer et al. (1998).},
  author = {R.B. Keigley},
  year = {2000},
  url = {https://pubs.usgs.gov/publication/70159719},
  note = {Source identifier: 70159719}
}