@misc{indiciae68c785c01b40,
  title = {Geologic map of the Fredonia quadrangle, western Kentucky},
  author = {William B. Rogers and William Henry Hays},
  year = {1967},
  doi = {10.3133/gq607},
  url = {https://pubs.usgs.gov/publication/gq607},
  note = {Source identifier: gq607}
}