@misc{indiciae294839a7811a,
  title = {Geologic map of Three Sisters volcanic cluster, Cascade Range, Oregon},
  author = {Wes Hildreth and Judy Fierstein and Andrew T. Calvert},
  year = {2012},
  doi = {10.3133/sim3186},
  url = {https://pubs.usgs.gov/publication/sim3186},
  note = {Source identifier: sim3186}
}