Columbia subject headings:
Egypt--Foreign relations--Ethiopia.
Ethiopia--Foreign relations--Egypt.
Ethiopia--Water-supply.
Water resources development--Ethiopia.
Water-supply--Political aspects--Egypt.
Harvard subject headings:
Egypt--Foreign relations--Ethiopia.
Ethiopia--Foreign relations--Egypt.
Ethiopia--Water-supply.
Water resources development--Ethiopia.
Water-supply--Political aspects--Egypt.
Princeton subject headings:
Egypt--Foreign relations--Ethiopia.
Ethiopia--Foreign relations--Egypt.
Ethiopia--Water-supply.
Water resources development--Ethiopia.
Water-supply--Political aspects--Egypt.