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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: 1973:Mar.10
    Date: 1973
    Page Range: 1-2
    Publication Info: Arcadia, County of Los Angeles, Public Services Division,
    Subjects: Horticulture -- Adult education  Horticulture -- Study and teaching (Elementary) --  Martin, Diane  Tree planting -- California  
  2. By: Hanson, George P. - Thorne, Linda
    Type: Article
    In: Lasca leaves
    Volume: 20
    Date: 1970
    Page Range: 35-36
    Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976
    Subjects: Plants -- Effect of photochemical smog on  Smog -- California -- Los Angeles County  Tree planting -- California