@misc{indiciae89b50e0264f2,
  title = {Geologic map of part of the Johnson Hollow quadrangle, Trigg County, Kentucky},
  author = {Harry Klemic and George E. Ulrich and Samuel L. Moore},
  year = {1968},
  doi = {10.3133/gq722},
  url = {https://pubs.usgs.gov/publication/gq722},
  note = {Source identifier: gq722}
}