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Principal Facts of the Earth's Magnetism and Methods of Determining the True Meridian and the Magnetic Declination. Reprinted from the United States Magnetic Declination Tables and Isogonic Charts For 1902

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Principal Facts of the Earth's Magnetism and Methods of Determining the True Meridian and the Magnetic Declination. Reprinted from the United States Magnetic Declination Tables and Isogonic Charts For 1902

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