@misc{indiciae78e055f0ed56,
  title = {Obsidian hydration dating and correlation of Bull Lake and Pinedale Glaciations near West Yellowstone, Montana},
  author = {Kenneth L. Pierce and J. Obradovich and Irving Friedman},
  year = {1976},
  doi = {10.1130/0016-7606(1976)87<703:ohdaco>2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70210759},
  note = {Source identifier: 70210759}
}