@misc{indiciaea9f1e6198c31,
  title = {Geologic map of the Bighill quadrangle, east-central Kentucky},
  author = {Gordon Whitney Weir and K. Y. Lee and P.E. Cassity},
  year = {1971},
  doi = {10.3133/gq900},
  url = {https://pubs.usgs.gov/publication/gq900},
  note = {Source identifier: gq900}
}