@misc{indiciae9be689ac7b06,
  title = {The National Volcano Early Warning System (NVEWS)},
  author = {John Ewert and Marianne Guffanti and Peter Cervelli and James Quick},
  year = {2006},
  doi = {10.3133/fs20063142},
  url = {https://pubs.usgs.gov/publication/fs20063142},
  note = {Source identifier: fs20063142}
}