@misc{indiciae705635c6c79f,
  title = {Professor Powell's Report of the survey of the Colorado of the West: Letter from the Secretary of the Smithsonian Institution, transmitting a report of Professor Powell on the survey of the Colorado River of the West and its tributaries},
  author = {John Wesley Powell},
  year = {1874},
  doi = {10.3133/70039910},
  url = {https://pubs.usgs.gov/publication/70039910},
  note = {Source identifier: 70039910}
}