@misc{indiciae4170901d353d,
  title = {Preliminary stratigraphic cross section of the Devonian in the eastern part of the Appalachian Basin showing radioactive shale zones},
  author = {Mareta N. West},
  year = {1977},
  doi = {10.3133/ofr77842},
  url = {https://pubs.usgs.gov/publication/ofr77842},
  note = {Source identifier: ofr77842}
}