Page:Climatic Cycles and Tree-Growth - 1919.djvu/5

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CLIMATIC CYCLES AND TREE-GROWTH


A STUDY OF THE ANNUAL RINGS OF TREES IN

RELATION TO CLIMATE AND SOLAR ACTIVITY




BY


A. E. DOUGLASS

Director of Steward Observatory, University of Arizona



Climatic Cycles and Tree-Growth Mark.jpg




Published by the Carnegie Institution of Washington

Washington, 1919