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The top documents tagged [number of groupss]
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number of groupss
1 History and Calibration of Sunspot Numbers Edward W. Cliver, AFRL Leif Svalgaard, Stanford Univ. Kenneth H. Schatten, a.i. Solutions IUGG XXV General.
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The Forgotten Sun
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1 The History of the Sunspot Number Leif Svalgaard Stanford University, California, USA AOGS, Singapore, August 2015 WSO.
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Reconciling Group and International Sunspot Numbers
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