@misc{indiciaec4e4d36ddb11,
  title = {Monitoring volcanoes; techniques and strategies used by the staff of the Cascades Volcano Observatory, 1980-90},
  author = {John W. Ewert and Donald A. Swanson},
  year = {1992},
  doi = {10.3133/b1966\_1992},
  url = {https://pubs.usgs.gov/publication/b1966\_1992},
  note = {Source identifier: b1966\_1992}
}