@misc{indiciae2615b979ada3,
  title = {Preliminary report on the clay mineralogy of the Upper Devonian Shales in the southern and middle Appalachian Basin},
  author = {John W. Hosterman and Patricia J. Loferski},
  year = {1978},
  doi = {10.3133/ofr781084},
  url = {https://pubs.usgs.gov/publication/ofr781084},
  note = {Source identifier: ofr781084}
}