@misc{indiciae6d658b4d5e3f,
  title = {National assessment of helium resources within known natural gas reservoirs},
  author = {Sean T. Brennan and Jennifer L. Rivera and Brian A. Varela and Andy J. Park},
  year = {2021},
  doi = {10.3133/sir20215085},
  url = {https://pubs.usgs.gov/publication/sir20215085},
  note = {Source identifier: sir20215085}
}