@misc{indiciaee9cff694fbe7,
  title = {Geologic map of the San Bernardino South Quadrangle, San Bernardino and Riverside counties, California},
  author = {Douglas M. Morton},
  year = {1978},
  doi = {10.3133/ofr7820},
  url = {https://pubs.usgs.gov/publication/ofr7820},
  note = {Source identifier: ofr7820}
}