Columbia subject headings:
Water resources development--Nile River Valley--History.
Water-supply--Political aspects--Nile River Valley.
Water-supply--Political aspects--Nile River Watershed.
Watershed management--Nile River Watershed--International cooperation.
Harvard subject headings:
Water resources development--Nile River Valley--History.
Water-supply--Political aspects--Nile River Valley.
Water-supply--Political aspects--Nile River Watershed.
Watershed management--Nile River Watershed--International cooperation.
Princeton subject headings:
Water resources development--Nile River Valley--History.
Water-supply--Political aspects--Nile River Valley.
Water-supply--Political aspects--Nile River Watershed.
Watershed management--Nile River Watershed--International cooperation.