@misc{indiciae552a55aff050,
  title = {Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, January 1987},
  author = {John B. Townshend and R. V. O’Connell and L.Y. Torrence},
  year = {1987},
  doi = {10.3133/ofr87300a},
  url = {https://pubs.usgs.gov/publication/ofr87300A},
  note = {Source identifier: ofr87300A}
}