@misc{indiciae9b0c1d2b2cc4,
  title = {Geologic map of the Brodhead quadrangle, east-central Kentucky},
  author = {James Louis Gualtieri},
  year = {1967},
  doi = {10.3133/gq662},
  url = {https://pubs.usgs.gov/publication/gq662},
  note = {Source identifier: gq662}
}