@misc{indiciae66d1c0c8099d,
  title = {Geologic map of the Olive Hill quadrangle, northeastern Kentucky},
  author = {Kenneth John Englund and John F. Windolph},
  year = {1975},
  doi = {10.3133/gq1270},
  url = {https://pubs.usgs.gov/publication/gq1270},
  note = {Source identifier: gq1270}
}