@misc{indiciae0a575f8a0b13,
  title = {The magnetic field of the earth-1985: Inclination chart},
  author = {N.W. Peddie and A.K. Zunde},
  year = {1988},
  doi = {10.3133/gp987i},
  url = {https://pubs.usgs.gov/publication/gp987I},
  note = {Source identifier: gp987I}
}