@misc{indiciaed6ae14d52cc6,
  title = {Preliminary geologic map of the Livermore quadrangle, Alameda and Contra Costa Counties, California},
  author = {T. W. Dibblee},
  year = {1980},
  doi = {10.3133/ofr80533b},
  url = {https://pubs.usgs.gov/publication/ofr80533B},
  note = {Source identifier: ofr80533B}
}