@misc{indiciae402744d0d260,
  title = {Radium distribution and indoor radon in the Pacific Northwest},
  author = {J. S. Duval and J. K. Otton},
  year = {2012},
  doi = {10.1029/gl017i006p00801},
  url = {https://pubs.usgs.gov/publication/70015928},
  note = {Source identifier: 70015928}
}