Columbia subject headings:
Saudi Arabia--Foreign relations--Yemen (Republic)
Yemen (Republic)--Foreign relations--Saudi Arabia.
Yemen, South--Foreign relations--Saudi Arabia.
Harvard subject headings:
Saudi Arabia--Foreign relations--Yemen, North.
Saudi Arabia--Foreign relations--Yemen, South.
Yemen (Arab Republic)--Foreign relations--Saudi Arabia.
Yemen (People's Democratic Republic)--Foreign relations--Saudi Arabia.
Princeton subject headings:
Saudi Arabia--Foreign relations--Yemen (People's Democratic Republic).
Saudi Arabia--Foreign relations--Yemen.
Yemen (People's Democratic Republic)--Foreign relations--Saudi Arabia.
Yemen--Foreign relations--Saudi Arabia.