Columbia subject headings:
Ecology--Lebanon--Congresses.
Human beings--Effect of environment on--Lebanon--Congresses.
Human ecology--Lebanon--Congresses.
Natural resources--Lebanon--Congresses.
Harvard subject headings:
Princeton subject headings:
Ecology--Lebanon--Congresses.
Human beings--Effect of environment on--Lebanon--Congresses.
Human ecology--Lebanon--Congresses.
Natural resources--Lebanon--Congresses.