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  1. A Contribution of Rain Forest Research to Evolutionary Theory
    By: Ashton, P S
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 64
    Date: 1977
    Page Range: 694--705
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  2. Ecology and the Durian Theory
    By: Ashton, P S
    Type: Article
    In: Gardens' Bulletin, Singapore
    Volume: 29
    Date: 1977
    Page Range: 19--23
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  3. Flora Malesiana Precursores: Dipterocarpaceae
    By: Ashton, P S
    Type: Article
    In: Gardens' Bulletin, Singapore
    Volume: 31
    Date: 1978
    Page Range: 5--48
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  4. New Tristaniopsis Peter G.Wilson & J.T.Waterh. (Myrtaceae) from Borneo
    By: Ashton, P S
    Type: Article
    In: Gardens' Bulletin, Singapore
    Volume: 57
    Date: 2005
    Page Range: 269--278
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  5. Taxonomic notes on the tree flora of Brunei: 1
    By: Ashton, P S
    Type: Article
    In: Gardens' Bulletin, Singapore
    Volume: 54
    Date: 2002
    Page Range: 207--216
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