@misc{indiciae981e3f35e34d,
  title = {A direct method for calculating instrument noise levels in side-by-side seismometer evaluations},
  author = {L. Gary Holcomb},
  year = {1989},
  doi = {10.3133/ofr89214},
  url = {https://pubs.usgs.gov/publication/ofr89214},
  note = {Source identifier: ofr89214}
}