@misc{indiciae4f9f82c081be,
  title = {Geologic map of the Vernon quadrangle, and part of the Celina quadrangle, Monroe and Cumberland Counties, Kentucky},
  author = {Richard Quintin Lewis},
  year = {1972},
  doi = {10.3133/gq966},
  url = {https://pubs.usgs.gov/publication/gq966},
  note = {Source identifier: gq966}
}