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Isodynamic

Continue to eBay Isodynamic Lines. World. SMALL sketch map 1886 old antique plan chart London United Kingdom £5.99 GBP
Continue to eBay Isogonous, Isoclinic & Isodynamic Lines. World 1886 old antique map plan chart London United Kingdom £19.99 GBP
Continue to eBay Terrestrial Magnetism. Declination. Inclination isodynamic in 1840 1787 1856 map London United Kingdom £43.99 GBP
Continue to eBay METEOROLOGY - Inclination and Isodynamic Charts - Antique 1851 Print #D296 Plymouth United Kingdom £14.5 GBP