@misc{indiciaefb57cbc16df9,
  title = {Preliminary bedrock-surface map of the San Francisco City area, California},
  author = {Julius Schlocker and D.H. Radbruch and Manuel G. Bonilla},
  year = {1954},
  doi = {10.3133/ofr54274},
  url = {https://pubs.usgs.gov/publication/ofr54274},
  note = {Source identifier: ofr54274}
}