@misc{indiciae583f38c21341,
  title = {Geologic map of the Union City quadrangle, Madison and Clark Counties, Kentucky},
  author = {George Clarke Simmons},
  year = {1967},
  doi = {10.3133/gq585},
  url = {https://pubs.usgs.gov/publication/gq585},
  note = {Source identifier: gq585}
}