@misc{indiciae059505b4d6e9,
  title = {Physiographic diagrams of Mount St. Helens, Washington showing changes in its summit crater, 1981},
  author = {T. R. Alpha and J. M. Morley and Bobbie Myers and Terry Leighley},
  year = {1982},
  doi = {10.3133/mf1420},
  url = {https://pubs.usgs.gov/publication/mf1420},
  note = {Source identifier: mf1420}
}