@misc{indiciae8469addea9a3,
  title = {Eruptions of Mount St. Helens : Past, present, and future},
  author = {Robert I. Tilling and Lyn J. Topinka and Donald A. Swanson},
  year = {1990},
  doi = {10.3133/7000008},
  url = {https://pubs.usgs.gov/publication/7000008},
  note = {Source identifier: 7000008}
}