@misc{indiciae0e778bb7f7ff,
  title = {Geologic map of the San Bernardino and Santa Ana 30' x 60' quadrangles, California},
  author = {Douglas M. Morton and Fred K. Miller},
  year = {2006},
  doi = {10.3133/ofr20061217},
  url = {https://pubs.usgs.gov/publication/ofr20061217},
  note = {Source identifier: ofr20061217}
}