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You searched for: Subject Geomagnetism--Secular variations Remove constraint Subject: Geomagnetism--Secular variations Subject Geoscientific Information Remove constraint Subject: Geoscientific Information Place United States Remove constraint Place: United States Place Alabama Remove constraint Place: Alabama
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1. Magnetic Field - Secular Variation of the Declination Component for the Epoch 2010.0

2010. National Geophysical Data Center. This map layer shows isoporic lines (lines of equal annual change, or secular variation, in the declination of the Earth's magnetic field), derived... National Atlas of the United States.