File:Climatic Cycles and Tree-Growth Plate 9.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:13, 9 August 2012 | 1,548 × 1,964 (295 KB) | Keith Edkins | == {{int:filedesc}} == {{Information |Description={{en|1=Plate 9. A. Periodogram of the sunspot numbers, 1755-1911. Corrugations show periods. The numbers give length of period in years. The white line is the year 1830 and shows phase. B. Differentia... |
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