Columbia subject headings:
Great Britain--Relations--Persian Gulf Region.
Persian Gulf Region--History--19th century.
Persian Gulf Region--History--20th century.
Persian Gulf Region--Relations--Great Britain.
Telegraph--Persian Gulf Region--History.
Telegraph--Persian Gulf States--History.
Harvard subject headings:
Great Britain--Colonies--Persian Gulf Region.
Great Britain--Foreign relations--Persian Gulf Region--History.
Military telegraph--Persian Gulf Region--History.
Persian Gulf Region--Foreign relations--Great Britain--History.
Telegraph--Persian Gulf Region--History.
Princeton subject headings: