@misc{indiciae1b64ac5c9e33,
  title = {Geologic map of the Church Hill quadrangle, Christian County, Kentucky},
  author = {George E. Ulrich},
  year = {1966},
  doi = {10.3133/gq556},
  url = {https://pubs.usgs.gov/publication/gq556},
  note = {Source identifier: gq556}
}