@misc{indiciae5b1df61480dc,
  title = {Geology of the Big Clifty quadrangle, Kentucky},
  author = {W. C. Swadley},
  year = {1962},
  doi = {10.3133/gq192},
  url = {https://pubs.usgs.gov/publication/gq192},
  note = {Source identifier: gq192}
}