@misc{indiciae9cd84f80e451,
  title = {Aggradation and degradation of alluvial sand deposits, 1965 to 1986, Colorado River, Grand Canyon National Park, Arizona; executive summary},
  author = {J. C. Schmidt and J.B. Graf},
  year = {1988},
  doi = {10.3133/ofr87561},
  url = {https://pubs.usgs.gov/publication/ofr87561},
  note = {Source identifier: ofr87561}
}