@misc{indiciaed33d7faffe95,
  title = {Permian salt deposits of the south-central United States},
  author = {N. H. Darton},
  year = {1921},
  doi = {10.3133/b715m},
  url = {https://pubs.usgs.gov/publication/b715M},
  note = {Source identifier: b715M}
}