Columbia subject headings:
Arid regions agriculture--Congresses.
Arid regions--Congresses.
Water resources development--Congresses.
Harvard subject headings:
Arid regions agriculture--Congresses
Arid regions--Congresses
Water resources development--Congresses
Princeton subject headings:
Arid regions agriculture--Congresses.
Arid regions--Congresses.
Water resources development--Congresses.