@misc{indiciaee0b68d538ef0,
  title = {Preliminary geologic map of the El Cajon 30' x 60' quadrangle, Southern California},
  author = {Victoria R. Todd},
  year = {2004},
  doi = {10.3133/ofr20041361},
  url = {https://pubs.usgs.gov/publication/ofr20041361},
  note = {Source identifier: ofr20041361}
}