@misc{indiciae96de193674ba,
  title = {Geologic map of the Prestonsburg quadrangle, Floyd and Johnson Counties, Kentucky},
  author = {Charles L. Rice},
  year = {1967},
  doi = {10.3133/gq641},
  url = {https://pubs.usgs.gov/publication/gq641},
  note = {Source identifier: gq641}
}