Columbia subject headings:
Great Britain--Foreign relations--Red Sea Region.
Red Sea Region--Foreign relations--Great Britain.
Red Sea Region--Politics and government.
Yemen, South--History.
Harvard subject headings:
Aden--History.
Great Britain--Foreign relations--Red Sea Region.
Red Sea Region--Foreign relations--Great Britain.
Red Sea Region--Politics and government.
Princeton subject headings:
Aden--History.
Great Britain--Foreign relations--Red Sea Region.
Red Sea Region--Foreign relations--Great Britain.
Red Sea Region--Politics and government.