@misc{indiciaeac012ea8beec,
  title = {Geologic map of the Buckhorn Quadrangle, southeastern Kentucky},
  author = {Walter Danilchik and Richard Quintin Lewis},
  year = {1976},
  doi = {10.3133/ofr76801},
  url = {https://pubs.usgs.gov/publication/ofr76801},
  note = {Source identifier: ofr76801}
}