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Please read BHL's Acknowledgment of Harmful Content
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  1. Type: Article
    In: Lasca leaves
    Volume: 25
    Date: 1975
    Page Range: 66-67
    Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976
    Subjects: Botany -- Study and teaching -- Activity programs  Environmental education -- Activity programs  Nature study -- Activity programs -- California  
  2. By: Call, Ronald B.
    Type: Article
    In: Lasca leaves
    Volume: 24
    Date: 1974
    Page Range: 38-39
    Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976
    Subjects: Botany -- Study and teaching -- Activity programs  Environmental education -- Activity programs  Nature study -- Activity programs -- California