@misc{indiciaed8a11ce17df9,
  title = {Tabulation of N 2 , O 2 , CO 2 , and He concentrations in soil gases collected on a regular basis for 11 months from a site at Tucson, Arizona},
  author = {M. E. Hinkle and T. F. Harms},
  year = {1992},
  doi = {10.3133/ofr92599},
  url = {https://pubs.usgs.gov/publication/ofr92599},
  note = {Source identifier: ofr92599}
}