@misc{indiciae262ccb7fa46b,
  title = {U.S. Geological Survey's alert notification system for volcanic activity},
  author = {Cynthia A. Gardner and Marianne C. Guffanti},
  year = {2007},
  doi = {10.3133/fs20063139},
  url = {https://pubs.usgs.gov/publication/fs20063139},
  note = {Source identifier: fs20063139}
}