@misc{indiciaeddffa70af930,
  title = {Chronology and references of volcanic eruptions and selected unrest in the United States, 1980-2008},
  author = {Angela K. Diefenbach and Marianne Guffanti and John W. Ewert},
  year = {2009},
  doi = {10.3133/ofr20091118},
  url = {https://pubs.usgs.gov/publication/ofr20091118},
  note = {Source identifier: ofr20091118}
}