@misc{indiciaec2a9acbb4dd6,
  title = {Preliminary geologic map of the San Bernardino 30' x 60' quadrangle, California (includes preliminary GIS database)},
  author = {Douglas M. Morton and Fred K. Miller},
  year = {2003},
  doi = {10.3133/ofr03293},
  url = {https://pubs.usgs.gov/publication/ofr03293},
  note = {Source identifier: ofr03293}
}