@misc{indiciaee4450253cf48,
  title = {Geologic map of the Cajon 7 1/2-minute quadrangle, San Bernardino County, California},
  author = {T. W. Dibblee},
  year = {1965},
  doi = {10.3133/ofr6542},
  url = {https://pubs.usgs.gov/publication/ofr6542},
  note = {Source identifier: ofr6542}
}