@misc{indiciae2d94e49119ec,
  title = {Geologic map of the Cardwell quadrangle, Washington and Mercer counties, Kentucky},
  author = {Warren Lee Peterson},
  year = {1977},
  doi = {10.3133/gq1379},
  url = {https://pubs.usgs.gov/publication/gq1379},
  note = {Source identifier: gq1379}
}