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Author
National Geophysical Data Center
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Subject
Geomagnetism--Secular variations
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Place
Puerto Rico
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Year
2010
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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.