@misc{indiciaec1095b33f7a2,
  title = {Geologic map of the Elizabethtown quadrangle, Hardin and Larue Counties, Kentucky},
  author = {Roy Clark Kepferle},
  year = {1966},
  doi = {10.3133/gq559},
  url = {https://pubs.usgs.gov/publication/gq559},
  note = {Source identifier: gq559}
}