@misc{indiciaeb8bfb2381932,
  title = {Radioactive coal and shale of Pennsylvanian and Permian age in northern West Virginia},
  author = {Elmer Davisson Patterson},
  year = {1954},
  doi = {10.3133/tei494},
  url = {https://pubs.usgs.gov/publication/tei494},
  note = {Source identifier: tei494}
}