@misc{indiciae807b216951c8,
  title = {Geologic map of the Hedges quadrangle, east-central Kentucky},
  author = {Douglas F. B. Black},
  year = {1975},
  doi = {10.3133/gq1235},
  url = {https://pubs.usgs.gov/publication/gq1235},
  note = {Source identifier: gq1235}
}