Published in Gardens' Bulletin, Singapore, in 1955, in volume 14, issue 2, pages 149-516

Published in Gardens' Bulletin Singapore, in 1955, in volume 14, issue 2, pages 517-529

Published in Gardens' Bulletin, Singapore, in 1955, in volume 14, issue 2, pages 530-533

Published in Gardens' Bulletin, Singapore, in 1955, in volume 14, issue 2, pages 534-545