@misc{indiciae98f65e2d3ab5,
  title = {A proposal to upgrade the Northern California seismic network},
  author = {D. H. Oppenheimer},
  year = {1995},
  doi = {10.3133/ofr95815},
  url = {https://pubs.usgs.gov/publication/ofr95815},
  note = {Source identifier: ofr95815}
}