@misc{indiciae987fe5a81b39,
  title = {Geologic map of the Crab Orchard quadrangle, Lincoln County, Kentucky},
  author = {James Louis Gualtieri},
  year = {1967},
  doi = {10.3133/gq571},
  url = {https://pubs.usgs.gov/publication/gq571},
  note = {Source identifier: gq571}
}