@misc{indiciaef9916301208c,
  title = {Preliminary list of deep borings in the United States Part II: Nebraska-Wyoming},
  author = {Nelson Horatio Darton},
  year = {1902},
  doi = {10.3133/wsp61},
  url = {https://pubs.usgs.gov/publication/wsp61},
  note = {Source identifier: wsp61}
}