@misc{indiciaee1591de51c70,
  title = {Seventh Annual report of the United States Geological Survey to the Secretary of the Interior, 1885-1886},
  author = {J. W. Powell},
  year = {1888},
  doi = {10.3133/ar7},
  url = {https://pubs.usgs.gov/publication/ar7},
  note = {Source identifier: ar7}
}