@misc{indiciae66cd7b036c4b,
  title = {Geologic map of the Nelsonville quadrangle, central Kentucky},
  author = {Warren Lee Peterson},
  year = {1966},
  doi = {10.3133/gq564},
  url = {https://pubs.usgs.gov/publication/gq564},
  note = {Source identifier: gq564}
}