@misc{indiciaeb8188e0bfc1d,
  title = {A global magnetic anomaly map},
  author = {Regan, R. D. and Cain, J. C. and Davis, W. M.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19760066841},
  note = {Source identifier: 19760066841}
}