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You searched for: Author National Geophysical Data Center Remove constraint Author: National Geophysical Data Center Subject Geomagnetism--Secular variations Remove constraint Subject: Geomagnetism--Secular variations Institution Stanford Remove constraint Institution: Stanford Place Cuba Remove constraint Place: Cuba
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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.