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Tree-ring patterns from white spruce trees in Alaska. Each ring represents a year of growth. The wide rings indicate good growing conditions (warmer summers in this case). Photo Credit: Nicole Davi.
Originally uploaded in TREX - Tree Ring Expeditions:TREX for Students.

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Uploaded: Aug14 17

Last Modified: 2017-08-14 17:06:48
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nicole davi, William Paterson University of New Jersey
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