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The Sunspot Cycle Yearly averaged Sunspot numbers between years 1610 and 2007 ... The Solar Cycle | Living Reviews in Solar Physics Sunspots Yearly Nasa Averaged 1610 2010
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The Sunspot Cycle Yearly averaged Sunspot numbers between years 1610 and 2007 ... The Solar Cycle | Living Reviews in Solar Physics Sunspots Yearly Nasa Averaged 1610 2010