@misc{indiciaefc6f605188a3,
  title = {Road guide to volcanic deposits of Mount St. Helens and vicinity, Washington},
  author = {Michael P. Doukas},
  year = {1990},
  doi = {10.3133/b1859},
  url = {https://pubs.usgs.gov/publication/b1859},
  note = {Source identifier: b1859}
}