@misc{indiciae3d834109d5c4,
  title = {Harmonic magnification of the complete telemetered seismic system, from seismometer to film viewer screen},
  author = {Jerry P. Eaton},
  year = {1975},
  doi = {10.3133/ofr7595},
  url = {https://pubs.usgs.gov/publication/ofr7595},
  note = {Source identifier: ofr7595}
}