20: Magnetic declination map of North America for the year 2010. Red... | Download Scientific Diagram
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USA. Showing magnetic declination in 1700 & 1750. Isogonic lines. USCGS - 1889 - old map - antique map - vintage map - USA maps: 0887440643208: Amazon.com: Books
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Map : Magnetic declination in the United States - Epoch 1980, 1980 Cartography Wall Art : | Map, Historical maps, Cartography
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