@misc{indiciae45b5c1838057,
  title = {Bedrock-surface map of the San Francisco North quadrangle, California, 1961},
  author = {M. G. Bonilla},
  year = {1972},
  doi = {10.3133/mf334},
  url = {https://pubs.usgs.gov/publication/mf334},
  note = {Source identifier: mf334}
}