@misc{indiciae08b2c1448d8b,
  title = {Preliminary geologic map of the Mt. Diablo - Byron area, Contra Costa, Alameda, and San Joaquin Counties, California},
  author = {Earl E. Brabb and H.S. Sonneman and J.R. Switzer},
  year = {1971},
  doi = {10.3133/ofr7153},
  url = {https://pubs.usgs.gov/publication/ofr7153},
  note = {Source identifier: ofr7153}
}