@misc{indiciaec8bedd58cae5,
  title = {Radioactivity of some coals and shales in southern Illinois},
  author = {E. D. Patterson},
  year = {1954},
  doi = {10.3133/tei466},
  url = {https://pubs.usgs.gov/publication/tei466},
  note = {Source identifier: tei466}
}