@misc{indiciae147e4cba2a16,
  title = {PNSN, Pacific Northwest Seismograph Network},
  author = {R.S. Ludwin},
  year = {2004},
  doi = {10.3133/fs20043073},
  url = {https://pubs.usgs.gov/publication/fs20043073},
  note = {Source identifier: fs20043073}
}