@misc{indiciae3c5e525bbad7,
  title = {The Black Canyon of the Gunnison: Today and Yesterday},
  author = {Wallace R. Hansen},
  year = {1965},
  doi = {10.3133/b1191},
  url = {https://pubs.usgs.gov/publication/b1191},
  note = {Source identifier: b1191}
}