@misc{indiciae53925920c6bd,
  title = {A compressed marine data set for geomagnetic field modeling},
  author = {Langel, R. A. and Baldwin, R. T. and Ridgway, J. R. and Davis, W. Minor},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910030392},
  note = {Source identifier: 19910030392}
}