Columbia subject headings:
Water resources development--Nile River Valley.
Water-supply--Political aspects--Nile River Valley.
Harvard subject headings:
Water resources development--Nile River Region.
Water rights--Nile River Region.
Water supply--Political aspects--Nile River Region.
Princeton subject headings:
Water resources development--Nile River Valley.
Water rights--Nile River Region.
Water-supply--Nile River Valley--Political aspects.