@misc{indiciae70e3d4cb7e03,
  title = {Geologic map of the Ault quadrangle, northeastern Kentucky},
  author = {A. Otis Delaney and Kenneth John Englund},
  year = {1973},
  doi = {10.3133/gq1066},
  url = {https://pubs.usgs.gov/publication/gq1066},
  note = {Source identifier: gq1066}
}