@misc{indiciaefd95b7ee7e16,
  title = {The Colorado River in Grand Canyon: how fast does it flow?},
  author = {Julia B. Graf},
  year = {1997},
  doi = {10.3133/fs16897},
  url = {https://pubs.usgs.gov/publication/fs16897},
  note = {Source identifier: fs16897}
}