@misc{indiciae28d144c7a7e2,
  title = {Geologic map of the Livermore Quadrangle, western Kentucky},
  author = {Dan E. Hansen and Avery E. Smith},
  year = {1978},
  doi = {10.3133/ofr78157},
  url = {https://pubs.usgs.gov/publication/ofr78157},
  note = {Source identifier: ofr78157}
}