@misc{indiciae7cca5a1e2312,
  title = {Isostatic residual gravity map of the Borrego Valley 1:100,000 quadrangle, California},
  author = {Victoria E. Langenheim and Robert C. Jachens},
  year = {1993},
  doi = {10.3133/ofr93246},
  url = {https://pubs.usgs.gov/publication/ofr93246},
  note = {Source identifier: ofr93246}
}