@misc{indiciaef08396463478,
  title = {Geologic map of the Coletown quadrangle, east-central Kentucky},
  author = {Douglas F. B. Black},
  year = {1967},
  doi = {10.3133/gq644},
  url = {https://pubs.usgs.gov/publication/gq644},
  note = {Source identifier: gq644}
}