@misc{indiciae3a7cbb69893b,
  title = {Geologic map of the Haleys Mill quadrangle, western Kentucky},
  author = {Robert Denny Trace},
  year = {1977},
  doi = {10.3133/gq1428},
  url = {https://pubs.usgs.gov/publication/gq1428},
  note = {Source identifier: gq1428}
}