@misc{indiciae6f7ac3411863,
  title = {Transcontinental geophysical survey (35°-39° N) magnetic map from the coast of California 133° W longitude},
  author = {R. K. Lattimore and B.G. Bassinger and Omar DeWald},
  year = {1968},
  doi = {10.3133/i531a},
  url = {https://pubs.usgs.gov/publication/i531A},
  note = {Source identifier: i531A}
}