Columbia subject headings:
Saudi Arabia--Foreign relations--Yemen (Republic)
Yemen (Republic)--Foreign relations--Saudi Arabia.
Yemen (Republic)--History.
Harvard subject headings:
Saudi Arabia--Foreign relations--Yemen (Republic)
Yemen (Republic)--Foreign relations--Saudi Arabia.
Yemen (Republic)--History.
Princeton subject headings:
Saudi Arabia--Foreign relations--Yemen.
Yemen (Republic)--History.
Yemen--Foreign relations--Saudi Arabia.