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The North American ozone air quality standard: efficacy and performance with two northern hardwood forest tree species. 2006. Percy, K.E.; Nosal, M.; Heilman, W.; Dann, T.; Sober, J.; Karnosky, D.F. Pages 85-90 in G. Wieser and M. Tausz, editors., Proceedings: UN-ECE Critical Levels of Ozone: Further Applying and Developing the Flux-based Concept. November 14-19, 2005, Obergurgl, Tyrol, Austria. Federal Research and Training Center for Forests, Natural Hazards and Landscape (BFW), Vienna, Austria.