@misc{indiciae876a81e58ed9,
  title = {Geochemical analyses and summaries of shale from Kentucky},
  author = {Jon J. Connor},
  year = {1981},
  doi = {10.3133/ofr811097},
  url = {https://pubs.usgs.gov/publication/ofr811097},
  note = {Source identifier: ofr811097}
}