@misc{indiciae2157d5f7fc05,
  title = {Index to potassium-argon ages of Cenozoic volcanic rocks of Oregon},
  author = {G. W. Walker and G. B. Dalrymple and M. A. Lanphere},
  year = {1974},
  doi = {10.3133/mf569},
  url = {https://pubs.usgs.gov/publication/mf569},
  note = {Source identifier: mf569}
}