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FILE - An unmodified, open-pollinated American chestnut bur grows on a tree at the State University of New York's College of Environmental Science & Forestry Lafayette Road Experiment Station in Syracuse, N.Y., Sept. 30, 2019. (AP Photo/Adrian Kraus, File)
Photo by: Adrian Kraus
FILE - An unmodified, open-pollinated American chestnut bur grows on a tree at the State University of New York's College of Environmental Science & Forestry Lafayette Road Experiment Station in Syracuse, N.Y., Sept. 30, 2019. (AP Photo/Adrian Kraus, File)

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