@misc{indiciae375f0927eb1b,
  title = {Geochronological data for the Pioneer Mountains, southwestern Montana; Part I, 40Ar/39Ar age-spectrum and conventional K/Ar dates for unaltered plutons},
  author = {L.W. Snee and J. F. Sutter},
  year = {1982},
  doi = {10.3133/ofr82961},
  url = {https://pubs.usgs.gov/publication/ofr82961},
  note = {Source identifier: ofr82961}
}