File:Climatic Cycles and Tree-Growth Fig 38.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:06, 10 August 2012 | 1,098 × 397 (41 KB) | Keith Edkins | == {{int:filedesc}} == {{Information |Description={{en|1=Fig. 38.—Triple sunspot cycle in a single tree from northern Norway. Lower curve, a 34-year cycle.}} |date=1919 |Source=''Climatic Cycles and Tree-Growth'' |Author=Andrew Ellicott Douglass |Per... |
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