@misc{indiciae7c3db57ae429,
  title = {Coal resources, production, and quality in the Eastern kentucky coal field: Perspectives on the future of steam coal production},
  author = {J.C. Hower and J.K. Hiett and G.D. Wild and C.F. Eble},
  year = {1994},
  doi = {10.1007/bf02259047},
  url = {https://pubs.usgs.gov/publication/70017582},
  note = {Source identifier: 70017582}
}