@misc{indiciaef70cee3598a6,
  title = {Airborne volcanic ash; a global threat to aviation},
  author = {Christina A. Neal and Marianne C. Guffanti},
  year = {2010},
  doi = {10.3133/fs20103116},
  url = {https://pubs.usgs.gov/publication/fs20103116},
  note = {Source identifier: fs20103116}
}