TY - RPRT TI - Tabulation of N 2 , O 2 , CO 2 , and He concentrations in soil gases collected regularly for 13 months at a site on the summit of Kilauea Volcano AU - M. E. Hinkle PY - 1990 DO - 10.3133/ofr90661 UR - https://pubs.usgs.gov/publication/ofr90661 ID - ofr90661 ER -