@misc{indiciae385545bc7951,
  title = {Geologic map of the Coiltown quadrangle, Hopkins County, Kentucky},
  author = {George J. Franklin},
  year = {1967},
  doi = {10.3133/gq629},
  url = {https://pubs.usgs.gov/publication/gq629},
  note = {Source identifier: gq629}
}