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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Walker, Harry G. - Leonard, Mortimer Demarest, - Enari, Leonid
    Type: Article
    In: Lasca leaves
    Volume: 19
    Date: 1969
    Page Range: 29-31
    Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976
    Subjects: Aphids -- Biological control  Aphids -- California  Aphids -- Host plants