@misc{indiciae0e1afdefe143,
  title = {Preliminary map of surficial materials in northwestern Riverside and southwestern San Bernardino counties, California},
  author = {Brett F. Cox and Douglas M. Morton},
  year = {1978},
  doi = {10.3133/ofr78977},
  url = {https://pubs.usgs.gov/publication/ofr78977},
  note = {Source identifier: ofr78977}
}