@misc{indiciae7670ec98442f,
  title = {Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska: June 1990},
  author = {John B. Townshend and Richard V. O’Connell and Carol Ann Varner},
  year = {1990},
  doi = {10.3133/ofr90300f},
  url = {https://pubs.usgs.gov/publication/ofr90300F},
  note = {Source identifier: ofr90300F}
}