@misc{indiciae7340636ced5e,
  title = {Volcanoes of the Paricutin region, Mexico},
  author = {Howel Williams},
  year = {1950},
  doi = {10.3133/b965b},
  url = {https://pubs.usgs.gov/publication/b965B},
  note = {Source identifier: b965B}
}