@misc{indiciaeaaa95d973573,
  title = {The distribution of tritium fallout in precipitation over North America},
  author = {L. L. Thatcher},
  year = {1962},
  doi = {10.1080/02626666209493255},
  url = {https://pubs.usgs.gov/publication/70220759},
  note = {Source identifier: 70220759}
}