@misc{indiciae35331b99996d,
  title = {Geologic map of the Howardstown quadrangle, central Kentucky},
  author = {Roy Clark Kepferle},
  year = {1966},
  doi = {10.3133/gq505},
  url = {https://pubs.usgs.gov/publication/gq505},
  note = {Source identifier: gq505}
}