@misc{indiciae444076c56d57,
  title = {Geologic map of the Calvert City quadrangle, Livingston and Marshall Counties, Kentucky},
  author = {Dewey Harold Amos and Warren Irvin Finch},
  year = {1968},
  doi = {10.3133/gq731},
  url = {https://pubs.usgs.gov/publication/gq731},
  note = {Source identifier: gq731}
}