@misc{indiciae51ba656d9a47,
  title = {Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, July 1987},
  author = {John B. Townshend and R. V. O’Connell and L.Y. Torrence},
  year = {1987},
  doi = {10.3133/ofr87300g},
  url = {https://pubs.usgs.gov/publication/ofr87300G},
  note = {Source identifier: ofr87300G}
}