@misc{indiciae647f7755c8b5,
  title = {Geologic map of the Utica quadrangle, western Kentucky},
  author = {William D. Johnson and Avery E. Smith},
  year = {1972},
  doi = {10.3133/gq995},
  url = {https://pubs.usgs.gov/publication/gq995},
  note = {Source identifier: gq995}
}