Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 1, pages 1-21

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 1, pages 23-32

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 1, pages 33-39

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 1, pages 41-51

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 1, pages 53-65

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 1, pages 107-112

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 1, pages 113-121

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 1, pages 123-128

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 2, pages 129-152

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 2, pages 153-171

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 2, pages 173-185

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 2, pages 187-191

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 2, pages 193-212

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 2, pages 213-228

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 2, pages 229-230

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 2, pages 231-257

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 2, pages 259-352

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 2, pages 353

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 1, pages 71-105

Published in Gardens' Bulletin Singapore, in 1967, in volume 22, issue 1, pages 67-70