@misc{indiciae83d812ff763a,
  title = {Geologic map of the Oak Level quadrangle, Western Kentucky},
  author = {Wilds W. Olive and R. W. Davis},
  year = {1968},
  doi = {10.3133/gq744},
  url = {https://pubs.usgs.gov/publication/gq744},
  note = {Source identifier: gq744}
}