@misc{indiciaef39bb0738dbb,
  title = {Rare-earth-element compositions of Cenozoic volcanic rocks in the Southern Rocky Mountains and adjacent areas},
  author = {Peter W. Lipman},
  year = {1987},
  doi = {10.3133/b1668},
  url = {https://pubs.usgs.gov/publication/b1668},
  note = {Source identifier: b1668}
}