@misc{indiciaef5b1823055a4,
  title = {Lithologic and stratigraphic description of cores of organic-rich shale of Late Devonian and Early Mississippian age in northeastern Kentucky},
  author = {R.C. Kepferle and J.G. Beard and J.D. Pollock},
  year = {1982},
  doi = {10.3133/ofr82219},
  url = {https://pubs.usgs.gov/publication/ofr82219},
  note = {Source identifier: ofr82219}
}