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By: Tan, Hugh T. W. - Choong, M F - Chua, K S - Loo, A. H. B. - Ahmad, Samsuri - Seah, E E L - Turner, I. M. (Ian Mark), - Yong, J. W. H. (Jean Wan Hong)Type: ArticleIn: The Gardens' bulletin, SingaporeVolume: 49Series: 4Issue:Date: 1997Page Range: 15--35Publication Info: Singapore, Govt. Print. Off. [etc.],Subjects: