@misc{indiciae81385907f2fc,
  title = {Preliminary stratigraphic cross section showing radioactive zones in the Devonian black shales in southeastern Ohio and west-central West Virginia},
  author = {Laure G. Wallace and J.B. Roen and Wallace De Witt},
  year = {1977},
  doi = {10.3133/ofr77839},
  url = {https://pubs.usgs.gov/publication/ofr77839},
  note = {Source identifier: ofr77839}
}