Columbia subject headings:
Nile River Valley--Political aspects.
Water rights--Nile River Valley.
Water-supply--Political aspects--Nile River Valley.
Harvard subject headings:
Nile River Valley--Politics and government.
Water rights--Nile River.
Water use--Egypt.
Water use--Sudan.
Water-supply--Political aspects--Nile River Region.
Princeton subject headings:
Nile River Valley--Political aspects.
Water rights--Nile River Valley.
Water-supply--Political aspects--Nile River Valley.