@misc{indiciae737c842e3ebf,
  title = {Preliminary stratigraphic cross section showing radioactive zone in the Devonian Black Shales in the western part of the Appalachian Basin},
  author = {Laure G. Wallace and John B. Roen and Wallace De Witt},
  year = {1977},
  doi = {10.3133/oc80},
  url = {https://pubs.usgs.gov/publication/oc80},
  note = {Source identifier: oc80}
}