@misc{indiciae1a9f58de84d5,
  title = {A visit to the Mammoth Cave region of Kentucky},
  author = {Willis T. Lee},
  year = {1925},
  doi = {10.3133/70204889},
  url = {https://pubs.usgs.gov/publication/70204889},
  note = {Source identifier: 70204889}
}