@misc{indiciae6b9465110c19,
  title = {Magnetic inclination in the United States; epoch 1975.0},
  author = {N.W. Peddie and W. J. Jones and E.B. Fabiano},
  year = {1976},
  doi = {10.3133/i912},
  url = {https://pubs.usgs.gov/publication/i912},
  note = {Source identifier: i912}
}