@misc{indiciae61d886247f85,
  title = {Gravity anomaly map of the United States; Part A: Conterminous United States},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1986},
  doi = {10.3133/gp964},
  url = {https://pubs.usgs.gov/publication/gp964},
  note = {Source identifier: gp964}
}