Ship logs and pottery show how the geomagnetic field has changed.
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References
GubbinsD., et al. Science, 312. 900 - 902 (2006).
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Harvard University
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On the maritime records of geomagnetism in the Age of Sail, by Art Jonkers
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Ball, P. Ancient mariners reveal tales from the Earth's core. Nature (2006). https://doi.org/10.1038/news060508-11
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DOI: https://doi.org/10.1038/news060508-11