@misc{indiciae75d23ea05fdc,
  title = {Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska},
  author = {John B. Townshend and R. V. O’Connell and Carol Ann Varner},
  year = {1989},
  doi = {10.3133/ofr89300a},
  url = {https://pubs.usgs.gov/publication/ofr89300A},
  note = {Source identifier: ofr89300A}
}