@misc{indiciae57b8c5762ba5,
  title = {Geologic map of the Palmer quadrangle, east-central Kentucky},
  author = {George Clarke Simmons},
  year = {1967},
  doi = {10.3133/gq613},
  url = {https://pubs.usgs.gov/publication/gq613},
  note = {Source identifier: gq613}
}