@misc{indiciae4e32634071cb,
  title = {Preliminary Bouguer gravity map of California: San Bernardino sheet},
  author = {Shawn Biehler and R. W. Tang and D. A. Ponce and H. W. Oliver},
  year = {1983},
  doi = {10.3133/ofr8396},
  url = {https://pubs.usgs.gov/publication/ofr8396},
  note = {Source identifier: ofr8396}
}