@misc{indiciae296919dd75cb,
  title = {Long-term change in perennial vegetation along the Colorado river in Grand Canyon national park (1889-2010)},
  author = {R. H. Webb and Jayne Belnap and M. L. Scott and Todd Esque},
  year = {2011},
  url = {https://pubs.usgs.gov/publication/70032701},
  note = {Source identifier: 70032701}
}