@misc{indiciae331e502448cb,
  title = {Preliminary geologic map of the Diablo quadrangle, Alameda and Contra Costa counties, California},
  author = {T. W. Dibblee},
  year = {1980},
  doi = {10.3133/ofr80546},
  url = {https://pubs.usgs.gov/publication/ofr80546},
  note = {Source identifier: ofr80546}
}