@misc{indiciaee94347170e89,
  title = {Exploration of the Colorado River of the West and its tributaries: Explored in 1869, 1870, 1871, and 1872, under the direction of the Secretary of the Smithsonian Institution},
  author = {John Wesley Powell},
  year = {1875},
  doi = {10.3133/70039238},
  url = {https://pubs.usgs.gov/publication/70039238},
  note = {Source identifier: 70039238}
}