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  1. By: Bonner, Harriet - Haagen-Smit, A. J. (Arie Jan),
    Type: Article
    In: Lasca leaves
    Volume: 17
    Issue: January 1967
    Date: 1967
    Page Range: 1-6
    Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976
  2. By: Haagen-Smit, A. J. (Arie Jan),
    Type: Article
    In: Lasca leaves
    Volume: 19
    Date: 1969
    Page Range: 32-35
    Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976