@misc{indiciae2f7b4219bd32,
  title = {Mount St. Helens ash fall in the Bull Run watershed, Oregon, March-April 1980},
  author = {Michael V. Shulters and Daphne G. Clifton},
  year = {1980},
  doi = {10.3133/ofr80740},
  url = {https://pubs.usgs.gov/publication/ofr80740},
  note = {Source identifier: ofr80740}
}