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Education Tools Digital Images These photographs depict the progression of growth and change in a Ponderosa pine forest over an 80-year period. The photographs, taken from the same vantage points in Bitterroot National Forest, demonstrate the changes resulting from fire exclusion and the removal of large pines. The photos were produced by the USDA Forest Service (Bitterroot Ecosystem Management Research Project, Intermountain Research Station, Northern Region).
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