@misc{indiciae4e5187c8a2cb,
  title = {Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, December 1987},
  author = {John B. Townshend and R. V. O’Connell and L.Y. Torrence},
  year = {1987},
  doi = {10.3133/ofr87300l},
  url = {https://pubs.usgs.gov/publication/ofr87300L},
  note = {Source identifier: ofr87300L}
}