@misc{indiciaec124c1d39f09,
  title = {An assessment of the near-surface accuracy of the international geomagnetic reference field 1980 model of the main geomagnetic field},
  author = {N.W. Peddie and A.K. Zunde},
  year = {1985},
  doi = {10.1016/0031-9201(85)90056-1},
  url = {https://pubs.usgs.gov/publication/70013280},
  note = {Source identifier: 70013280}
}