Columbia subject headings:
Water resources development--Law and legislation.
Water resources development--Nile River Watershed.
Water-supply--International cooperation.
Water-supply--Management.
Water-supply--Nile River Watershed.
Harvard subject headings:
Water use--Nile River Watershed.
Water-supply--Political aspects--Nile River Watershed.
Watershed management--Nile River Watershed.
Princeton subject headings: