@misc{indiciaee6d2390477c5,
  title = {Preliminary Bouguer gravity map of the Sacramento 1° x 2° quadrangle, California},
  author = {H. W. Oliver and S. L. Robbins},
  year = {1974},
  doi = {10.3133/ofr74183},
  url = {https://pubs.usgs.gov/publication/ofr74183},
  note = {Source identifier: ofr74183}
}