@misc{indiciae6943a05180be,
  title = {Principal coal beds in the Buckhorn quadrangle, Breathitt, Leslie, and Perry Counties, Kentucky},
  author = {Philip T. Stafford and Kenneth J. Englund},
  year = {1953},
  doi = {10.3133/coal15},
  url = {https://pubs.usgs.gov/publication/coal15},
  note = {Source identifier: coal15}
}