@misc{indiciae1f8ed7c9a914,
  title = {Progress report upon geographical and geological explorations and surveys west of the one hundredth meridian, in 1872, under the direction of Brigadier General A.A. Humphreys, Chief of Engineers, United States Army},
  author = {George Montague Wheeler},
  year = {1874},
  doi = {10.3133/70039937},
  url = {https://pubs.usgs.gov/publication/70039937},
  note = {Source identifier: 70039937}
}