@misc{indiciaeceb745ece7b7,
  title = {Geologic map of the Dawson Springs quadrangle, western Kentucky},
  author = {Thomas M. Kehn},
  year = {1966},
  doi = {10.3133/gq573},
  url = {https://pubs.usgs.gov/publication/gq573},
  note = {Source identifier: gq573}
}