Columbia subject headings:
Harvard subject headings:
Ecology--Orinoco River Region (Venezuela and Colombia)--Congresses.
Orinoco River (Venezuela and Colombia)--Congresses.
Stream ecology--Orinoco River (Venezuela and Colombia)--Congresses.
Princeton subject headings:
Biotic communities--Orinoco River (Venezuela and Colombia).
Orinoco River (Venezuela and Colombia)
Stream ecology--Orinoco River (Venezuela and Colombia).