@misc{indiciae6896982f16bf,
  title = {Test and calibration of the Digital World-Wide Standardized Seismograph},
  author = {Jon Peterson and Charles R. Hutt},
  year = {1982},
  doi = {10.3133/ofr821087},
  url = {https://pubs.usgs.gov/publication/ofr821087},
  note = {Source identifier: ofr821087}
}