@misc{indiciae7e2904bc9311,
  title = {Bedrock-surface map of the San Francisco South quadrangle, California},
  author = {Manuel G. Bonilla},
  year = {1964},
  doi = {10.3133/ofr6416},
  url = {https://pubs.usgs.gov/publication/ofr6416},
  note = {Source identifier: ofr6416}
}