@misc{indiciae8839025406b5,
  title = {Magnetic declination in the United States; epoch 1975.0},
  author = {E.B. Fabiano},
  year = {1975},
  doi = {10.3133/i911},
  url = {https://pubs.usgs.gov/publication/i911},
  note = {Source identifier: i911}
}