@misc{indiciae23bc039fa940,
  title = {Map of earthquake epicenters in the San Francisco Bay Area, California: 1972-1989},
  author = {Jean A. Olson and P. K. Showalter},
  year = {1991},
  doi = {10.3133/ofr91299},
  url = {https://pubs.usgs.gov/publication/ofr91299},
  note = {Source identifier: ofr91299}
}