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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Johnson, Albert G
    Type: Article
    In: Rhodora
    Volume: 56
    Date: 1954
    Page Range: 129--131
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Sax, Karl, - Johnson, Albert G
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 36
    Issue: 1
    Date: 1955
    Page Range: 110--114
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  3. By: Johnson, Albert G - Smithberg, Margaret H
    Type: Article
    In: Rhodora
    Volume: 69
    Date: 1967
    Page Range: 457--459
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Johnson, Albert G
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 33
    Issue: 2
    Date: 1952
    Page Range: 179--187
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-