Gordon Jacoby and Jobie Carlisle saw a log section of old white spruce for paleoclimatic studies in Thelon River, Canada, in the summer 1984. Photo: Rosanne D'Arrigo"/> Gordon Jacoby and Jobie Carlisle saw a log section of old white spruce for paleoclimatic studies in Thelon River, Canada, in the summer 1984. Photo: Rosanne D'Arrigo">
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black and white photo of researchers sawing a log in sandy landscape

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