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