@misc{indiciae8dbad6fd06c0,
  title = {Geologic map of the Greenville quadrangle, Muhlenberg County, Kentucky},
  author = {Thomas M. Kehn},
  year = {1971},
  doi = {10.3133/gq907},
  url = {https://pubs.usgs.gov/publication/gq907},
  note = {Source identifier: gq907}
}