@misc{indiciae487699647dc5,
  title = {Observations on the palynology, petrography and geochemistry of the Western Kentucky number 4 coal bed},
  author = {C.F. Eble and S.F. Greb and D.A. Williams and J.C. Hower},
  year = {1999},
  doi = {10.1016/s0166-5162(98)00042-1},
  url = {https://pubs.usgs.gov/publication/70021717},
  note = {Source identifier: 70021717}
}