@misc{indiciae51e3a693d491,
  title = {Oblique synoptic images, produced from digital data, display strong evidence of a "new" caldera in southwestern Guatemala},
  author = {W. Duffield and G. Heiken and D. Foley and A. McEwen},
  year = {1993},
  url = {https://pubs.usgs.gov/publication/70018325},
  note = {Source identifier: 70018325}
}