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Great Mystery of Earth's Magnetism. The Experiment. p. 140. ISBN 978-1-61519-132-1. "Historical Seismograms from the Potsdam Station" (PDF). Academy...14 KB (1,329 words) - 03:26, 19 March 2024
Mystery of Earth's Magnetism. Wellington, NZ: Awa Press. p. 6. ISBN 978-1-61519-132-1. Nicander of Colophon (1953) [source text c. 185–136 BCE]. A.S.F....10 KB (1,105 words) - 00:46, 12 December 2023
