@misc{indiciae08b8263147ea,
  title = {Frequency of earthquakes for selected areas in the western United States for the period 1945-59},
  author = {W.S. Twenhofel and R.A. Black and D.F. Balsinger},
  year = {1962},
  doi = {10.3133/ofr62137},
  url = {https://pubs.usgs.gov/publication/ofr62137},
  note = {Source identifier: ofr62137}
}