@misc{indiciae8dd42b6f02a4,
  title = {Encounters of aircraft with volcanic ash clouds: A compilation of known incidents, 1953-2009},
  author = {Marianne Guffanti and Thomas J. Casadevall and Karin Budding},
  year = {2010},
  doi = {10.3133/ds545},
  url = {https://pubs.usgs.gov/publication/ds545},
  note = {Source identifier: ds545}
}