@misc{indiciae9505651ee11a,
  title = {Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska: March 1981},
  author = {John B. Townshend and J.E. Papp and E.A. Sauter},
  year = {1981},
  doi = {10.3133/ofr81300c},
  url = {https://pubs.usgs.gov/publication/ofr81300C},
  note = {Source identifier: ofr81300C}
}