@misc{indiciae8374a131ffc5,
  title = {Geologic map of the Ketchen quadrangle, Tennessee-Kentucky},
  author = {Kenneth John Englund},
  year = {1966},
  doi = {10.3133/gq500},
  url = {https://pubs.usgs.gov/publication/gq500},
  note = {Source identifier: gq500}
}