@misc{indiciaedfcca45a7445,
  title = {Preliminary stratigraphic cross section showing radioactive zones in the Devonian black shales in the southern part of the Appalachian Basin},
  author = {Roy Clark Kepferle and Edward Norman Wilson and Frank Robert Ettensohn},
  year = {1978},
  doi = {10.3133/oc85},
  url = {https://pubs.usgs.gov/publication/oc85},
  note = {Source identifier: oc85}
}