@misc{indiciae57a999e85b7a,
  title = {Depositional history of the Fire Clay coal bed (Late Duckmantian), Eastern Kentucky, USA},
  author = {S.F. Greb and C.F. Eble and J.C. Hower},
  year = {1999},
  doi = {10.1016/s0166-5162(99)00004-x},
  url = {https://pubs.usgs.gov/publication/70021448},
  note = {Source identifier: 70021448}
}