@misc{indiciae08d8bbe1d6eb,
  title = {Geologic map of the Richmond North quadrangle, Madison and Fayette Counties, Kentucky},
  author = {George Clarke Simmons},
  year = {1967},
  doi = {10.3133/gq583},
  url = {https://pubs.usgs.gov/publication/gq583},
  note = {Source identifier: gq583}
}