@misc{indiciae77033274632f,
  title = {Sixth Annual report of the United States Geological Survey to the Secretary of the Interior, 1884-1885},
  author = {J. W. Powell},
  year = {1885},
  doi = {10.3133/ar6},
  url = {https://pubs.usgs.gov/publication/ar6},
  note = {Source identifier: ar6}
}