@misc{indiciaecb343f8afa7c,
  title = {Geologic map of the Riverside quadrangle, Butler and Warren Counties, Kentucky},
  author = {Fred R. Shawe},
  year = {1968},
  doi = {10.3133/gq736},
  url = {https://pubs.usgs.gov/publication/gq736},
  note = {Source identifier: gq736}
}