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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ihrig, Herbert G.
    Type: Article
    In: Arnoldia
    Volume: 2
    Issue: 10
    Date: 1942
    Page Range: 53--56
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Ihrig, Herbert G.
    Type: Article
    In: Bulletin of popular information - Arnold Arboretum, Harvard University
    Volume: 7
    Series: 4
    Issue: 2
    Date: 1939-04-28
    Page Range: 5--12
    Publication Info: Jamaica Plain, Mass. [etc.], Arnold Arboretum,