@misc{indiciae40cf04871bbe,
  title = {Geologic map of the Sacramento quadrangle, western Kentucky},
  author = {Dan E. Hansen},
  year = {1976},
  doi = {10.3133/gq1306},
  url = {https://pubs.usgs.gov/publication/gq1306},
  note = {Source identifier: gq1306}
}