@misc{indiciae7f6131713c4f,
  title = {Survey of helium in natural water wells and springs in Southwest Montana and vicinity},
  author = {Willis P. Doering and Irving Friedman},
  year = {1980},
  doi = {10.3133/ofr80181},
  url = {https://pubs.usgs.gov/publication/ofr80181},
  note = {Source identifier: ofr80181}
}