@misc{indiciaef48e2007f3f1,
  title = {Aeromagnetic map of the northern Mother Lode area, California},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1969},
  doi = {10.3133/gp671},
  url = {https://pubs.usgs.gov/publication/gp671},
  note = {Source identifier: gp671}
}