TY  - RPRT
TI  - Environmental conditions affecting concentrations of He, CO2, O2 and N2 in soil gases
AU  - Margaret Hinkle
PY  - 1994
DO  - 10.1016/0883-2927(94)90052-3
UR  - https://pubs.usgs.gov/publication/70186674
ID  - 70186674
ER  -