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United States Department of Agriculture


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https://www.fs.usda.gov/treesearch/content/pdf?name=Effects%20of%20Tropospheric%20O3%20on%20Trembling%20Aspen%20and%20Interaction%20with%20CO2:%20Results%20from%20an%20O3-Gradient%20and%20a%20FACE%20Experiment