@misc{indiciae28097e710732,
  title = {Geologic map of the Spring Lick quadrangle, western Kentucky},
  author = {Benjamin Gildersleeve and William D. Johnson},
  year = {1978},
  doi = {10.3133/gq1475},
  url = {https://pubs.usgs.gov/publication/gq1475},
  note = {Source identifier: gq1475}
}