@misc{indiciaef11723c5e67b,
  title = {Geologic map of Tecuamburro Volcano and surrounding area, Guatemala},
  author = {W. A. Duffield and G.H. Wohletz and L.W. Maasen and Gabriel Dengo and Oscar Pinzon},
  year = {1991},
  doi = {10.3133/i2197},
  url = {https://pubs.usgs.gov/publication/i2197},
  note = {Source identifier: i2197}
}