@misc{indiciae5f51a0e0e76d,
  title = {Progress on detection of radioactivity by airborne equipment},
  author = {Frank W. Stead},
  year = {1949},
  doi = {10.3133/tei83},
  url = {https://pubs.usgs.gov/publication/tei83},
  note = {Source identifier: tei83}
}