@misc{indiciaec44fafa3956c,
  title = {Geologic map of the Louellen quadrangle, southeastern Kentucky},
  author = {A.J. Froelich},
  year = {1973},
  doi = {10.3133/gq1060},
  url = {https://pubs.usgs.gov/publication/gq1060},
  note = {Source identifier: gq1060}
}