@misc{indiciaeaf14e54a6c90,
  title = {Geology of the Portersburg quadrangle, Kentucky},
  author = {Joel B. Pomerene},
  year = {1964},
  doi = {10.3133/gq359},
  url = {https://pubs.usgs.gov/publication/gq359},
  note = {Source identifier: gq359}
}