@misc{indiciae7e9549a2d39d,
  title = {Pre-1980 tephra-fall deposits erupted from Mount St. Helens, Washington},
  author = {Donal R. Mullineaux},
  year = {1996},
  doi = {10.3133/pp1563},
  url = {https://pubs.usgs.gov/publication/pp1563},
  note = {Source identifier: pp1563}
}