@misc{indiciae22e9560bbb16,
  title = {Geology of the Parrot quadrangle, Kentucky},
  author = {D. F. Crowder},
  year = {1963},
  doi = {10.3133/gq236},
  url = {https://pubs.usgs.gov/publication/gq236},
  note = {Source identifier: gq236}
}