@misc{indiciaea468aa65f426,
  title = {Did the Middlesboro, Kentucky, bolide impact event influence coal rank?},
  author = {J.C. Hower and S.F. Greb and K.W. Kuehn and C.F. Eble},
  year = {2009},
  doi = {10.1016/j.coal.2009.05.003},
  url = {https://pubs.usgs.gov/publication/70036483},
  note = {Source identifier: 70036483}
}