@misc{indiciae3f2bb9b4e85f,
  title = {Aeromagnetic map of parts of the San Diego, Santa Ana, and adjacent 1° x 2° quadrangles, California},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1990},
  doi = {10.3133/ofr90206},
  url = {https://pubs.usgs.gov/publication/ofr90206},
  note = {Source identifier: ofr90206}
}