@misc{indiciaeb00980b2654f,
  title = {Geomagnetic observations on tristan da cunha, south atlantic ocean},
  author = {J. Matzka and N. Olsen and C.F. Maule and L.W. Pedersen and A.M. Berarducci and S. Macmillan},
  year = {2010},
  doi = {10.4401/ag-4633},
  url = {https://pubs.usgs.gov/publication/70035944},
  note = {Source identifier: 70035944}
}