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Magnetic Declination Isogonic Lines for the year 1870 (Variations of the Compass): Geographicus Rare Antique Maps
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2 Observations of magnetic declination by Jesuits in Europe and the... | Download Scientific Diagram
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World map of magnetic declination measured from 1827 to 1831 published... | Download Scientific Diagram
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18. Maps of magnetic declination of the MGMF nondipole part for years... | Download Scientific Diagram
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