@misc{indiciae128d930ce816,
  title = {Geologic map of the Ashbrook quadrangle, central Kentucky},
  author = {Warren Lee Peterson},
  year = {1976},
  doi = {10.3133/gq1289},
  url = {https://pubs.usgs.gov/publication/gq1289},
  note = {Source identifier: gq1289}
}