Physiological and foliar symptom response in the crowns of Prunus serotina, Fraxinus americana, and Acer rubrum canopy trees to ambient ozone under forest conditions. - Schaub,M..; Skelly,J..M..; Zhang,J..W..; Ferdinand,J..A..; Savage,J..E..; Stevenson,R..E..; Davis,D..D..; Steiner,K..C.. (Environmental Pollution, 2005)