@misc{indiciae1cf1ed10f183,
  title = {Geologic map of the Morgantown quadrangle, Butler and Warren Counties, Kentucky},
  author = {Benjamin Gildersleeve},
  year = {1972},
  doi = {10.3133/gq1040},
  url = {https://pubs.usgs.gov/publication/gq1040},
  note = {Source identifier: gq1040}
}