@misc{indiciae6a81bd03237b,
  title = {Geologic map of the Hyden West quadrangle, Leslie and Perry Counties, Kentucky},
  author = {Richard Quinton Lewis},
  year = {1978},
  doi = {10.3133/gq1468},
  url = {https://pubs.usgs.gov/publication/gq1468},
  note = {Source identifier: gq1468}
}