@misc{indiciae86f3a6a45225,
  title = {Potassium-argon ages bearing on the igneous and tectonic history of the Elk Mountains and vicinity, Colorado: A preliminary report},
  author = {John D. Obradovich and Felix E. Mutschler and Bruce Bryant},
  year = {1969},
  doi = {10.1130/0016-7606(1969)80[1749:paboti]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70223876},
  note = {Source identifier: 70223876}
}