@misc{indiciaeaaddfb8322cd,
  title = {Magnetic declination in the United States; epoch 1980},
  author = {E.B. Fabiano and N.W. Peddie},
  year = {1981},
  doi = {10.3133/i1283},
  url = {https://pubs.usgs.gov/publication/i1283},
  note = {Source identifier: i1283}
}