Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 1-11

Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 13-180

Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 181-184

Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 185-335

Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 337-346

Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 347-349

Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 351-354

Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 355-359

Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 361-373

Published in Gardens' Bulletin Singapore, in 1969, in volume 25, issue 1, pages 1-104

Published in Gardens' Bulletin Singapore, in 1969, in volume 25, issue 1, pages 105-108

Published in Gardens' Bulletin Singapore, in 1969, in volume 25, issue 1, pages 109-110

Published in Gardens' Bulletin Singapore, in 1969, in volume 25, issue 1, pages 111-178