@misc{indiciae5bed8dc452d0,
  title = {Isostatic Gravity Map with Geology of the Santa Ana 30' x 60' Quadrangle, Southern California},
  author = {V.E. Langenheim and Tien-Chang Lee and Shawn Biehler and R.C. Jachens and D. M. Morton},
  year = {2006},
  doi = {10.3133/sim2951},
  url = {https://pubs.usgs.gov/publication/sim2951},
  note = {Source identifier: sim2951}
}