@misc{indiciaec9cdc76ef450,
  title = {Ninth Annual report of the United States Geological Survey to the Secretary of the Interior, 1887-1888},
  author = {J. W. Powell},
  year = {1889},
  doi = {10.3133/ar9},
  url = {https://pubs.usgs.gov/publication/ar9},
  note = {Source identifier: ar9}
}