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Chart of the curves of equal magnetic variation between the Lat. 60⁰N and Lat. 55⁰S from the Admiralty Chart E. & G.W. Blunt 1860 / published by E. & G.W. Blunt. -
Lines of equal magnetic variation for 1930. | Download Scientific Diagram
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Lines of equal magnetic variation for 1930. | Download Scientific Diagram
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