@misc{indiciaedb79f4be5f28,
  title = {Geologic map of the Mount Vernon quadrangle, Rockcastle County, Kentucky},
  author = {Seymour O. Schlanger and Gordon Whitney Weir},
  year = {1971},
  doi = {10.3133/gq902},
  url = {https://pubs.usgs.gov/publication/gq902},
  note = {Source identifier: gq902}
}