@misc{indiciae4360756d2fa4,
  title = {Survey of helium in natural water wells and springs in southwest Montana and vicinity; Part II},
  author = {Willis P. Doering and Irving Friedman},
  year = {1980},
  doi = {10.3133/ofr801257},
  url = {https://pubs.usgs.gov/publication/ofr801257},
  note = {Source identifier: ofr801257}
}