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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Crabbe, J A
    Type: Article
    In: The Gardens' bulletin, Singapore
    Volume: 30
    Series: 4
    Date: 1977
    Page Range: 221--238
    Publication Info: Singapore, Govt. Print. Off. [etc.],
  2. By: Smith, Alan R., - Jermy, A C - Crabbe, J A - Thomas, Barry A.
    Type: Article
    In: American fern journal
    Volume: 64
    Date: 1974
    Page Range: 117--118
    Publication Info: [Washington, etc.] American Fern Society