@misc{indiciaee1e7d39bbc4d,
  title = {Geologic map of the northern Santa Ana Mountains, Orange and Riverside Counties, California},
  author = {J. E. Schoellhamer and D.M. Kinney and R. F. Yerkes and J. G. Vedder},
  year = {1954},
  doi = {10.3133/om154},
  url = {https://pubs.usgs.gov/publication/om154},
  note = {Source identifier: om154}
}