@misc{indiciae23b1346165ca,
  title = {Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, January 1991},
  author = {John B. Townshend and Richard V. O’Connell and Carol Ann Varner},
  year = {1991},
  doi = {10.3133/ofr91300a},
  url = {https://pubs.usgs.gov/publication/ofr91300A},
  note = {Source identifier: ofr91300A}
}