Columbia subject headings:
Gibraltar--History.
Gibraltar--International status.
Great Britain--Foreign relations--Spain.
Spain--Foreign relations--Great Britain.
United Nations--Gibraltar.
Harvard subject headings:
Gibraltar--History
Gibraltar--International status.
Great Britain--Foreign relations--Spain.
Spain--Foreign relations--Great Britain
United Nations--Gibraltar.
Princeton subject headings:
Gibraltar--History.
Gibraltar--International status.
Great Britain--Foreign relations--Spain.
Spain--Foreign relations--Great Britain.
United Nations--Gibraltar.