@misc{indiciae933925b25052,
  title = {Geologic map of the Simpsonville quadrangle, Shelby and Spencer Counties, Kentucky},
  author = {Warren Lee Peterson},
  year = {1978},
  doi = {10.3133/gq1461},
  url = {https://pubs.usgs.gov/publication/gq1461},
  note = {Source identifier: gq1461}
}