@misc{indiciaed68afd2a4de3,
  title = {Geologic map of the Nolansburg quadrangle, southeastern Kentucky},
  author = {Bela Csejtey},
  year = {1970},
  doi = {10.3133/gq868},
  url = {https://pubs.usgs.gov/publication/gq868},
  note = {Source identifier: gq868}
}