@misc{indiciae28310bc94f8d,
  title = {Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska: April 1980},
  author = {John B. Townshend and J.E. Papp and E.A. Sauter and S.P. Tilton},
  year = {1980},
  doi = {10.3133/ofr80300d},
  url = {https://pubs.usgs.gov/publication/ofr80300D},
  note = {Source identifier: ofr80300D}
}