@misc{indiciae272c2cf8e124,
  title = {Geologic map of the Sacramento Quadrangle, western Kentucky},
  author = {Dan E. Hansen},
  year = {1976},
  doi = {10.3133/ofr76720},
  url = {https://pubs.usgs.gov/publication/ofr76720},
  note = {Source identifier: ofr76720}
}