@misc{indiciaea0bf68944fc7,
  title = {Radioactivity and uranium content of some Cretaceous shales, central Great Plains},
  author = {Harry A. Tourtelot},
  year = {1955},
  doi = {10.3133/tei298},
  url = {https://pubs.usgs.gov/publication/tei298},
  note = {Source identifier: tei298}
}