@misc{indiciaeba275a0c87b9,
  title = {Aeromagnetic map of the El Cajon 1:100,000 scale Quadrangle, California},
  author = {Robert C. Jachens},
  year = {1992},
  doi = {10.3133/ofr92548},
  url = {https://pubs.usgs.gov/publication/ofr92548},
  note = {Source identifier: ofr92548}
}