TY  - RPRT
TI  - Near-surface helium anomalies associated with faults and gas accumulations in western Pennsylvania
AU  - A.A. Roberts
AU  - J.B. Roen
PY  - 1985
DO  - 10.3133/ofr85546
UR  - https://pubs.usgs.gov/publication/ofr85546
ID  - ofr85546
ER  -