@misc{indiciae0e54b1ff1cc6,
  title = {Geologic map of the Princeton East quadrangle, Caldwell County, Kentucky},
  author = {Robert Denny Trace},
  year = {1972},
  doi = {10.3133/gq1032},
  url = {https://pubs.usgs.gov/publication/gq1032},
  note = {Source identifier: gq1032}
}