@misc{indiciae8cfb896dced3,
  title = {Preliminary stratigraphic cross sections showing radioactive zones in the Devonian black shales in the central part of the Appalachian Basin},
  author = {John B. Roen and Laure G. Wallace and Wallace De Witt},
  year = {1978},
  doi = {10.3133/oc87},
  url = {https://pubs.usgs.gov/publication/oc87},
  note = {Source identifier: oc87}
}