@misc{indiciaea2c17cbea190,
  title = {Upgraded gravity anomaly base of the United States},
  author = {Gordon R. Keller and T.G. Hildenbrand and Robert Kucks and D. Roman and A. M. Hittelman},
  year = {2002},
  doi = {10.1190/1.1471598},
  url = {https://pubs.usgs.gov/publication/70024804},
  note = {Source identifier: 70024804}
}