@misc{indiciaed0032ace6693,
  title = {Geologic map of the Isonville quadrangle, eastern Kentucky},
  author = {Kenneth John Englund and A. Otis Delaney},
  year = {1966},
  doi = {10.3133/gq501},
  url = {https://pubs.usgs.gov/publication/gq501},
  note = {Source identifier: gq501}
}