@misc{indiciae4d5e01c1758c,
  title = {Preliminary geomagnetic data, College Observatory, Fairbanks, August 1989},
  author = {J.B. Townshend and R. V. O’Connell and C.A. Varner},
  year = {1989},
  doi = {10.3133/ofr89300g},
  url = {https://pubs.usgs.gov/publication/ofr89300G},
  note = {Source identifier: ofr89300G}
}