Charts. Magnetic declination. Lines of equal magnetic declination and of equal annual change in United States for 1935; chart 3077. Scale 100 m.=0.9 in.
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Magnetic declination. Lines of equal magnetic declination and of equal annual change in United States for 1935; chart 3077. Scale 100 m.=0.9 in.
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Charts. Magnetic declination. Lines of equal magnetic declination and of equal annual change in United States for 1935; chart 3077. Scale 100 m.=0.9 in.