@misc{indiciaef29104559a71,
  title = {Mount St. Helens ash fall in the Bull Run watershed, Oregon, May-June 1980},
  author = {Michael V. Shulters and Daphne G. Clifton},
  year = {1980},
  doi = {10.3133/ofr80593},
  url = {https://pubs.usgs.gov/publication/ofr80593},
  note = {Source identifier: ofr80593}
}