@misc{indiciaef7fb276beff1,
  title = {Bouguer gravity map of the San Francisco Bay region, California, northwest sector},
  author = {S. L. Robbins and C. W. Roberts and R. H. Chapman},
  year = {1977},
  doi = {10.3133/mf780a},
  url = {https://pubs.usgs.gov/publication/mf780A},
  note = {Source identifier: mf780A}
}