@misc{indiciae47835aa7eaba,
  title = {Geologic map of the Scalf Quadrangle, southeastern Kentucky},
  author = {Paul L. Weis},
  year = {1975},
  doi = {10.3133/ofr7539},
  url = {https://pubs.usgs.gov/publication/ofr7539},
  note = {Source identifier: ofr7539}
}