@misc{indiciae0ff1f7bb8d29,
  title = {Geologic map of the Hartford quadrangle, Ohio County, Kentucky},
  author = {Gus H. Goudarzi},
  year = {1968},
  doi = {10.3133/gq741},
  url = {https://pubs.usgs.gov/publication/gq741},
  note = {Source identifier: gq741}
}