@misc{indiciae8ae0776d4f95,
  title = {Tabulation of meteorological variables and concentrations of helium, carbon dioxide, oxygen, and nitrogen in soil gases collected regularly from a site at Reston, Virginia, for one year},
  author = {Margaret Hinkle and Kristin O. Dennen},
  year = {1989},
  doi = {10.3133/ofr8910},
  url = {https://pubs.usgs.gov/publication/ofr8910},
  note = {Source identifier: ofr8910}
}