@misc{indiciaec54116139eee,
  title = {Geologic map of the central San Juan caldera cluster, southwestern Colorado},
  author = {Peter W. Lipman},
  year = {2006},
  doi = {10.3133/i2799},
  url = {https://pubs.usgs.gov/publication/i2799},
  note = {Source identifier: i2799}
}