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Please read BHL's Acknowledgment of Harmful Content
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  1. Type: Article
    In: Newsletter Arboreta and Botanic Gardens
    Volume: 1972:May.10
    Date: 1972
    Page Range: 1
    Publication Info: Arcadia, County of Los Angeles, Public Services Division,
    Subjects: Air pollution -- Research  Hanson, George P  Thorne, Linda  Tree planting -- California -- Pasadena