@misc{indiciaebe39de6094c1,
  title = {Geologic map of the Corona North 7.5' quadrangle, Riverside and San Bernardino Counties, California},
  author = {Douglas M. Morton and C. H. Gray and Kelly R. Bovard and Michael Dawson},
  year = {2002},
  doi = {10.3133/ofr0222},
  url = {https://pubs.usgs.gov/publication/ofr0222},
  note = {Source identifier: ofr0222}
}