@misc{indiciaee07da5f87cef,
  title = {Survey of the Colorado River of the West: Letter from the Secretary of the Smithsonian Institution, transmitting report preliminary for continuing the survey of the Colorado of the West and its tributaries},
  author = {John Wesley Powell},
  year = {1872},
  doi = {10.3133/70039905},
  url = {https://pubs.usgs.gov/publication/70039905},
  note = {Source identifier: 70039905}
}