@misc{indiciae9bd30c6379b3,
  title = {Report on the Geological and Geographical Survey of the Rocky Mountain region},
  author = {John Wesley Powell},
  year = {1877},
  doi = {10.3133/70039914},
  url = {https://pubs.usgs.gov/publication/70039914},
  note = {Source identifier: 70039914}
}