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