@misc{indiciae115c3ab6eedd,
  title = {Thirteenth Annual report of the United States Geological Survey to the Secretary of the Interior, 1891-1892: Part 2. Geology},
  author = {J. W. Powell},
  year = {1893},
  doi = {10.3133/ar13\_2},
  url = {https://pubs.usgs.gov/publication/ar13\_2},
  note = {Source identifier: ar13\_2}
}