@misc{indiciae0a3ab6e40122,
  title = {Geologic map of the Ogle quadrangle, Clay and Knox Counties, Kentucky},
  author = {Russell G. Ping and R.E. Sergeant},
  year = {1978},
  doi = {10.3133/gq1484},
  url = {https://pubs.usgs.gov/publication/gq1484},
  note = {Source identifier: gq1484}
}