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Published in Gardens' Bulletin, Singapore, in 1977, in volume 29, pages 3-11

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Published in Gardens' Bulletin Singapore, in 1977, in volume 29, pages 35-39

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Published in Gardens' Bulletin, Singapore, in 1977, in volume 29, pages 103-126

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Published in Gardens' Bulletin Singapore, in 1977, in volume 29, pages 175-181

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Published in Gardens' Bulletin Singapore, in 1977, in volume 29, pages 183-189

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Published in Gardens' Bulletin Singapore, in 1977, in volume 29, pages 191-205

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Published in Gardens' Bulletin, Singapore, in 1977, in volume 29, pages 207-232

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Published in Gardens' Bulletin, Singapore, in 1977, in volume 29, pages 239-250

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Published in Gardens' Bulletin, Singapore, in 1977, in volume 29, pages 255-266

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Published in Gardens' bulletin, Singapore, in 1977, in volume 30, pages 1-3

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Published in Gardens' bulletin, Singapore, in 1977, in volume 30, pages 5

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Published in Gardens' bulletin, Singapore, in 1977, in volume 30, pages 13-15

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Published in Gardens' bulletin, Singapore, in 1977, in volume 30, pages 79-83

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Published in Gardens' bulletin, Singapore, in 1977, in volume 30, pages 123-164

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Published in Gardens' bulletin, Singapore, in 1977, in volume 30, pages 165-219

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Published in Gardens' bulletin, Singapore, in 1977, in volume 30, pages 239-250

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Published in Gardens' bulletin, Singapore, in 1977, in volume 30, pages 251-267

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Published in Gardens' bulletin, Singapore, in 1977, in volume 30, pages 269-274

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