@misc{indiciaec01aa61d3b43,
  title = {Geologic map of the Salvisa quadrangle, central Kentucky},
  author = {Earle Rupert Cressman},
  year = {1968},
  doi = {10.3133/gq760},
  url = {https://pubs.usgs.gov/publication/gq760},
  note = {Source identifier: gq760}
}