@misc{indiciaee920add18f0c,
  title = {Geologic map and digital database of the Pinto Mountain 7.5 minute quadrangle, Riverside County, California},
  author = {Robert E. Powell},
  year = {2002},
  doi = {10.3133/ofr02491},
  url = {https://pubs.usgs.gov/publication/ofr02491},
  note = {Source identifier: ofr02491}
}