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Start Over You searched for: Subject Geomagnetism--Secular variations Remove constraint Subject: Geomagnetism--Secular variations Creator National Geophysical Data Center Remove constraint Creator: National Geophysical Data Center Member Of stanford-cv275yx9215 Remove constraint Member Of: stanford-cv275yx9215

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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.