@misc{indiciae4077e0e74b79,
  title = {Geologic map of the Nortonville quadrangle, Hopkins and Christian Counties, Kentucky},
  author = {James Edward Palmer},
  year = {1968},
  doi = {10.3133/gq762},
  url = {https://pubs.usgs.gov/publication/gq762},
  note = {Source identifier: gq762}
}