@misc{indiciae29754780570e,
  title = {Geology of the Polkville quadrangle, Kentucky},
  author = {Benjamin Gildersleeve},
  year = {1962},
  doi = {10.3133/gq194},
  url = {https://pubs.usgs.gov/publication/gq194},
  note = {Source identifier: gq194}
}