@misc{indiciae1b11f4f2ee17,
  title = {Preliminary geologic map of the Perris 7.5' quadrangle, Riverside County, California},
  author = {Douglas M. Morton and Kelly R. Bovard and Rachel M. Alvarez},
  year = {2003},
  doi = {10.3133/ofr03270},
  url = {https://pubs.usgs.gov/publication/ofr03270},
  note = {Source identifier: ofr03270}
}