@misc{indiciae79d1d8345139,
  title = {Preliminary stratigraphic cross section showing radioactive zones in the Devonian dark shales in the eastern part of the Appalachian Basin},
  author = {Mareta N. West},
  year = {1978},
  doi = {10.3133/oc86},
  url = {https://pubs.usgs.gov/publication/oc86},
  note = {Source identifier: oc86}
}