@misc{indiciaea1d5b761f0b3,
  title = {General distribution of geologic materials in the San Francisco Bay region, California: A digital map database},
  author = {C. M. Wentworth},
  year = {1997},
  doi = {10.3133/ofr97744},
  url = {https://pubs.usgs.gov/publication/ofr97744},
  note = {Source identifier: ofr97744}
}