@misc{indiciaeb81d5a9026ea,
  title = {Preliminary list of deep borings in the United States, Part I, Alabama-Montana},
  author = {Nelson Horatio Darton},
  year = {1902},
  doi = {10.3133/wsp57},
  url = {https://pubs.usgs.gov/publication/wsp57},
  note = {Source identifier: wsp57}
}