@misc{indiciae20f92c6650e8,
  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/ofr89300d},
  url = {https://pubs.usgs.gov/publication/ofr89300D},
  note = {Source identifier: ofr89300D}
}