@misc{indiciae817e899341c7,
  title = {Near-surface helium anomalies associated with faults and gas accumulations in western Pennsylvania},
  author = {A.A. Roberts and J.B. Roen},
  year = {1985},
  doi = {10.3133/ofr85546},
  url = {https://pubs.usgs.gov/publication/ofr85546},
  note = {Source identifier: ofr85546}
}