@misc{indiciaef2014a1030ef,
  title = {Geologic map of the Haddix quadrangle, eastern Kentucky},
  author = {Robert B. Mixon},
  year = {1965},
  doi = {10.3133/gq447},
  url = {https://pubs.usgs.gov/publication/gq447},
  note = {Source identifier: gq447}
}