Columbia subject headings:
Water resources development--Arab countries.
Water use--Arab countries.
Water-supply--Arab countries.
Harvard subject headings:
Water resources development--Arab countries
Water use--Arab countries.
Water-supply--Arab countries
Princeton subject headings:
National security--Arab countries.
Water resources development--Arab countries.
Water resources development--Nile River Valley.
Water use--Arab countries.
Water-supply--Arab countries.
Water-supply--Nile River Valley.
Water-supply--Political aspects--Arab countries.