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  1. By: Hanson, George P.
    Type: Article
    In: Lasca leaves
    Volume: 20
    Date: 1970
    Page Range: 78-81, 92
    Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976
    Subjects: Air -- Pollution -- California  Plants -- Effect of photochemical smog on