@misc{indiciaea3535e3c31b3,
  title = {Hydrology problems as related to wilderness management and water supplies for recreational areas at Mammoth Cave National Park, Kentucky},
  author = {R.V. Cushman},
  year = {1967},
  doi = {10.3133/ofr6772},
  url = {https://pubs.usgs.gov/publication/ofr6772},
  note = {Source identifier: ofr6772}
}