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Sunspot Count Periodicities in Different Zurich Sunspot Group Classes since 1986. http://t.co/bVSkdLGire
Sunspot Count Periodicities in Different Zurich Sunspot Group Classes since 1986. http://t.co/bVSkdLGire
Sunspot Count Periodicities in Different Zurich Sunspot Group Classes since 1986. http://t.co/bVSkdLGire
Sunspot Count Periodicities in Different Zurich Sunspot Group Classes since 1986. http://t.co/bVSkdLGire