@misc{indiciae616ef6f36557,
  title = {Geologic map of the Hyden West quadrangle, Leslie and Perry Counties, Kentucky},
  author = {Richard Quintin Lewis},
  year = {1977},
  doi = {10.3133/ofr77878},
  url = {https://pubs.usgs.gov/publication/ofr77878},
  note = {Source identifier: ofr77878}
}