@misc{indiciae0d4492b50c21,
  title = {Geologic map of the Samuels quadrangle, north-central Kentucky},
  author = {Roy Clark Kepferle},
  year = {1969},
  doi = {10.3133/gq824},
  url = {https://pubs.usgs.gov/publication/gq824},
  note = {Source identifier: gq824}
}