@misc{indiciaef92cb764b47a,
  title = {Digital magnetic-anomaly map of central United States: Description of major features},
  author = {T.G. Hildenbrand and R.P. Kucks and R. E. Sweeney},
  year = {1983},
  doi = {10.3133/gp955},
  url = {https://pubs.usgs.gov/publication/gp955},
  note = {Source identifier: gp955}
}