Columbia subject headings:
Harvard subject headings:
Trees--Age determination--Congresses.
Trees--Age determination--Tropics--Congresses.
Trees--Growth--Measurement--Congresses.
Trees--Tropics--Age determination--Congresses.
Trees--Tropics--Growth--Measurement--Congresses.
Tropical plants--Age determination--Congresses
Tropical plants--Growth--Measurement--Congresses.
Princeton subject headings:
Trees--Growth--Congresses.
Trees--Tropics--Congresses.