Page:Climatic Cycles and Tree-Growth - 1919.djvu/95

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CORRELATION WITH SUNSPOTS.
Climatic Cycles and Tree-Growth Fig 22.jpg

Fig. 22.—Sunspot numbers and annual rings in spruce tree from south Sweden.

Climatic Cycles and Tree-Growth Fig 23.jpg

Fig. 23.—Six European groups, standardized and smoothed.