TY  - RPRT
TI  - Concentrations of N 2 , O 2 , CO 2 , and He in soil gases collected in the northern San Luis Valley, Colorado
AU  - M. E. Hinkle
PY  - 1993
DO  - 10.3133/ofr93584
UR  - https://pubs.usgs.gov/publication/ofr93584
ID  - ofr93584
ER  -