@misc{indiciae01bb9dc22c11,
  title = {Survey of helium in natural water wells and springs in southwest Montana and vicinity and Imperial Valley, California; Part III, January 1 - December 31, 1980},
  author = {Willis P. Doering and Irving Friedman and Guida Veronda},
  year = {1981},
  doi = {10.3133/ofr81893},
  url = {https://pubs.usgs.gov/publication/ofr81893},
  note = {Source identifier: ofr81893}
}