@misc{indiciaede68daf83fd0,
  title = {First international symposium on Volcanic ash and aviation safety},
  author = {Thomas J. Casadevall},
  year = {1991},
  doi = {10.3133/cir1065},
  url = {https://pubs.usgs.gov/publication/cir1065},
  note = {Source identifier: cir1065}
}