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 M. E.  Fenn, et al., ?Setting limits: Using air pollution thresholds to protect and restore U.S. ecosystems?, Issues in Ecology, no. 14, p. 1-21, 2011.\par \par  G. M.  Lovett, et al., ?Effects of Air Pollution on Ecosystems and Biological Diversity in the Eastern United States?, Year in Ecology and Conservation Biology 2009, vol. 1162, p. 99-135, 2009.\par \par }