@misc{indiciae2afb1639616a,
  title = {Tabulation of N 2 , O 2 , CO 2 , and He concentrations in soil gases collected daily for 11 months from 0.3-, 0.6-, 1.2-, and 2.0-m depths},
  author = {M. E. Hinkle},
  year = {1990},
  doi = {10.3133/ofr90686},
  url = {https://pubs.usgs.gov/publication/ofr90686},
  note = {Source identifier: ofr90686}
}