@misc{indiciaef85e2fd015c4,
  title = {Geologic map of the Cromwell quadrangle, Butler and Ohio Counties, Kentucky},
  author = {Benjamin Gildersleeve},
  year = {1975},
  doi = {10.3133/gq1250},
  url = {https://pubs.usgs.gov/publication/gq1250},
  note = {Source identifier: gq1250}
}