Columbia subject headings:
Arab countries--Foreign relations--Yemen (Republic)
Yemen (Republic)--Foreign relations--Arab countries.
Yemen (Republic)--History--1962-1972.
Harvard subject headings:
Arab countries--Foreign relations--Yemen (Republic).
Yemen (Republic)--Foreign relations--Arab countries.
Yemen (Republic)--History--1962-1972.
Princeton subject headings:
Arab countries--Foreign relations--Yemen.
Yemen--Foreign relations--Arab countries.
Yemen--History--1962-