@misc{indiciaef8a35cc8a9a3,
  title = {The first 20 years of CALNET, the Northern California seismic network},
  author = {D. H. Oppenheimer and Fred W. Klein and Jerry P. Eaton},
  year = {1992},
  doi = {10.3133/ofr92209},
  url = {https://pubs.usgs.gov/publication/ofr92209},
  note = {Source identifier: ofr92209}
}