@misc{indiciaeeaeeb1c9b091,
  title = {Volcanic ash and aviation safety; proceedings of the First international symposium on Volcanic ash and aviation safety},
  author = {Thomas J. Casadevall},
  year = {1994},
  doi = {10.3133/b2047},
  url = {https://pubs.usgs.gov/publication/b2047},
  note = {Source identifier: b2047}
}