@misc{indiciae6ec331896c54,
  title = {Preliminary geologic map of the Los Angeles 7.5' quadrangle, southern California: A digital database},
  author = {R.F. Yerkes and S. E. Graham},
  year = {1997},
  doi = {10.3133/ofr97432},
  url = {https://pubs.usgs.gov/publication/ofr97432},
  note = {Source identifier: ofr97432}
}