@misc{indiciae43686ade5961,
  title = {Radioactivity of coal and associated rock in the coal fields of eastern Kentucky and southern West Virginia},
  author = {Stewart William Welch},
  year = {1953},
  doi = {10.3133/tei347a},
  url = {https://pubs.usgs.gov/publication/tei347A},
  note = {Source identifier: tei347A}
}