@misc{indiciae7780e0eaff5e,
  title = {John Wesley Powell: soldier, explorer, scientist},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1970},
  doi = {10.3133/70039264},
  url = {https://pubs.usgs.gov/publication/70039264},
  note = {Source identifier: 70039264}
}