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CORRELATION WITH SUNSPOTS.
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Fig. 22.—Sunspot numbers and annual rings in spruce tree from south Sweden.
Fig. 23.—Six European groups, standardized and smoothed.
Page:Climatic Cycles and Tree-Growth - 1919.djvu/95
Fig. 22.—Sunspot numbers and annual rings in spruce tree from south Sweden.
Fig. 23.—Six European groups, standardized and smoothed.