@misc{indiciae14d1392c17eb,
  title = {Geologic map of the Central City East quadrangle, Muhlenberg and Ohio Counties, Kentucky},
  author = {James Edward Palmer},
  year = {1972},
  doi = {10.3133/gq1031},
  url = {https://pubs.usgs.gov/publication/gq1031},
  note = {Source identifier: gq1031}
}