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By: Len, Lim-Ho Chee - Kheng, Phua Lek - Chein, Low Neok - Jin, Goh ChongType: ArticleIn: The Gardens' bulletin, SingaporeVolume: 43Series: 4Issue: 1Date: 1991Page Range: 27--38Publication Info: Singapore, Govt. Print. Off. [etc.],Subjects: