@misc{indiciae5af695504b4a,
  title = {Revised volcanic history of the San Juan, Uncompahgre, Silverton, and Lake City calderas in the western San Juan Mountains, Colorado},
  author = {Peter W. Lipman and Thomas A. Steven and Robert G. Luedke and Wilbur Burbank},
  year = {1973},
  url = {https://pubs.usgs.gov/publication/70161990},
  note = {Source identifier: 70161990}
}