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By: Hanson, George P. - Thorne, LindaType: ArticleIn: Lasca leavesVolume: 22Series:Issue:Date: 1972Page Range: 60-65Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976Subjects: Air quality -- Environmental aspects Plants -- Effect of ozone on Plants -- Effect of photochemical smog on