@misc{indiciae13127a98616c,
  title = {Radon in soils of parts of Cameron, Hidalgo, and Willacy Counties, Texas},
  author = {Joseph S. Duval},
  year = {2005},
  doi = {10.3133/ofr20051423},
  url = {https://pubs.usgs.gov/publication/ofr20051423},
  note = {Source identifier: ofr20051423}
}