@misc{indiciaecab7b925a385,
  title = {Age of the Boulder batholith and other batholiths of western Montana},
  author = {Randolph W. Chapman and David Gottfried and Claude L. Waring},
  year = {1954},
  doi = {10.3133/tei420},
  url = {https://pubs.usgs.gov/publication/tei420},
  note = {Source identifier: tei420}
}