@misc{indiciae3c7a8e94539c,
  title = {Environmental conditions affecting concentrations of He, CO2, O2 and N2 in soil gases},
  author = {Margaret Hinkle},
  year = {1994},
  doi = {10.1016/0883-2927(94)90052-3},
  url = {https://pubs.usgs.gov/publication/70186674},
  note = {Source identifier: 70186674}
}