@misc{indiciae8976a3cb2984,
  title = {Formation and distribution of coal balls in the Herrin Coal (Pennsylvanian), Franklin County, Illinois Basin, USA},
  author = {P.J. DeMaris},
  year = {2022},
  doi = {10.1144/jgs.157.1.221},
  url = {https://pubs.usgs.gov/publication/70022249},
  note = {Source identifier: 70022249}
}