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Please read BHL's Acknowledgment of Harmful Content
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  1. 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  
  2. By: Noble, Wilfred
    Type: Article
    In: Lasca leaves
    Volume: 14
    Issue: Autumn 1964
    Date: 1964
    Page Range: 74-75
    Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976
    Subjects: Guaiac  Plants -- Effect of photochemical smog on -- Calif  Smog -- California -- Los Angeles County