@misc{indiciaee68614d034f3,
  title = {Coal reserves of eastern Kentucky},
  author = {John Warfield Huddle and E.J. Lyons and H.L. Smith and J.C. Ferm},
  year = {1963},
  doi = {10.3133/b1120},
  url = {https://pubs.usgs.gov/publication/b1120},
  note = {Source identifier: b1120}
}