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