@misc{indiciae301c8363ec51,
  title = {Coal resources of the Campton quadrangle, Wolfe, Lee, and Breathitt Counties, Kentucky},
  author = {Reginald Peter Briggs},
  year = {1957},
  doi = {10.3133/coal42},
  url = {https://pubs.usgs.gov/publication/coal42},
  note = {Source identifier: coal42}
}