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Astronomical Society of the Pacific. Bibcode:2002ASPC..269...85G. ISBN 978-1-58381-109-2. Staff (4 March 2010). "Oldest measurement of Earth's magnetic field...219 KB (19,285 words) - 14:30, 24 May 2024
Astronomical Society of the Pacific. Bibcode:2002ASPC..269...85G. ISBN 978-1-58381-109-2. Voosen, Paul (March 9, 2021). "Ancient Earth was a water world"....127 KB (16,950 words) - 08:11, 23 May 2024
