@misc{indiciae9664e45d2f0b,
  title = {Geologic map of the Platoro Caldera area, southeastern San Juan Mountains, southwestern Colorado},
  author = {P. W. Lipman},
  year = {1974},
  doi = {10.3133/i828},
  url = {https://pubs.usgs.gov/publication/i828},
  note = {Source identifier: i828}
}