@misc{indiciae7e600c4c6bce,
  title = {Field studies of radon in rocks, soils, and water},
  author = {Richard B. Wanty},
  year = {1991},
  doi = {10.3133/b1971},
  url = {https://pubs.usgs.gov/publication/b1971},
  note = {Source identifier: b1971}
}