@misc{indiciae77000ee235e8,
  title = {Aeromagnetic map of the San Diego 1:100,000-scale quadrangle, California-Baja California Norte},
  author = {Victoria E. Langenheim and Robert C. Jachens},
  year = {1993},
  doi = {10.3133/ofr93564},
  url = {https://pubs.usgs.gov/publication/ofr93564},
  note = {Source identifier: ofr93564}
}