@misc{indiciae4870b28852ec,
  title = {Calibration and acceptance testing of the DE-200 digital seismograph with S-6000 and L-4C seismometers},
  author = {D. L. Carver and D.R. Cunningham and K. W. King},
  year = {1986},
  doi = {10.3133/ofr86340},
  url = {https://pubs.usgs.gov/publication/ofr86340},
  note = {Source identifier: ofr86340}
}