@misc{indiciaea835ea5bcc95,
  title = {Geologic history of the Black Hills caves, South Dakota},
  author = {Arthur N. Palmer and Margaret Palmer and James B. Paces},
  year = {2016},
  doi = {10.1130/2015.2516(07)},
  url = {https://pubs.usgs.gov/publication/70169113},
  note = {Source identifier: 70169113}
}