@misc{indiciae9a1775f0899f,
  title = {Microprobe analysis of biotites - A method of correlating tuff beds in the Green River Formation, Colorado and Utah},
  author = {George A. Desborough and Janet K. Pitman and John Roswell Donnell},
  year = {1973},
  url = {https://pubs.usgs.gov/publication/70159645},
  note = {Source identifier: 70159645}
}