TY  - RPRT
TI  - Long-term change in perennial vegetation along the Colorado river in Grand Canyon national park (1889-2010)
AU  - R. H. Webb
AU  - Jayne Belnap
AU  - M. L. Scott
AU  - Todd Esque
PY  - 2011
UR  - https://pubs.usgs.gov/publication/70032701
ID  - 70032701
ER  -