@misc{indiciae7894e63cd0a5,
  title = {Aeromagnetic map of the southern California borderland east of the Patton Escarpment},
  author = {Victoria E. Langenheim},
  year = {1993},
  doi = {10.3133/ofr93520},
  url = {https://pubs.usgs.gov/publication/ofr93520},
  note = {Source identifier: ofr93520}
}