@misc{indiciae62e8c5c59269,
  title = {Present investigations of radioactive raw materials by the Geological Survey and a recommended program for future work},
  author = {A.P. Butler and F.W. Stead},
  year = {1947},
  doi = {10.3133/tei36},
  url = {https://pubs.usgs.gov/publication/tei36},
  note = {Source identifier: tei36}
}