@misc{indiciae72f7af2a08a8,
  title = {Geologic map of the Panola quadrangle, Estill and Madison Counties, Kentucky},
  author = {Robert C. Greene},
  year = {1968},
  doi = {10.3133/gq686},
  url = {https://pubs.usgs.gov/publication/gq686},
  note = {Source identifier: gq686}
}