@misc{indiciaecb8512538e9b,
  title = {The magnetic field of the earth, 1980 magnetic horizontal intensity},
  author = {E. B. Fabiano and N.W. Peddie and A.K. Zunde},
  year = {1983},
  doi = {10.3133/i1459},
  url = {https://pubs.usgs.gov/publication/i1459},
  note = {Source identifier: i1459}
}