@misc{indiciae6adffffbd1f2,
  title = {Survey of helium in soil gases of Long Valley, California},
  author = {Margaret Hinkle and James E. Kilburn},
  year = {1980},
  doi = {10.3133/ofr80612},
  url = {https://pubs.usgs.gov/publication/ofr80612},
  note = {Source identifier: ofr80612}
}