Abstract

The climatic record afforded by tree growth has been discussed in geo graphic literature in the United States over a period of 30 years. The dis cussion began with Ellsworth Huntington, who was interested in tree growth as a support for his thesis of climatic change (1). Later studies, published by the American Geographical Society and the National Geo graphic Society, have applied the data of tree growth to the dating of Indian ruins in the Southwest and to the formulation of rainfall indices for this and other areas.

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