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United States Department of Agriculture


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https://www.fs.usda.gov/treesearch/content/pdf?name=Ozone%20bioindicators%20and%20forest%20health:%20a%20guide%20to%20the%20evaluation,%20analysis,%20and%20interpretation%20of%20the%20ozone%20injury%20data%20in%20the%20Forest%20Inventory%20and%20Analysis%20Program