Columbia subject headings:
Harvard subject headings:
Germany--History, Naval.
Germany. Kriegsmarine--History.
Great Britain--History, Naval
Great Britain. Royal Navy--History.
Princeton subject headings:
Germany--Foreign relations--Great Britain.
Germany. Kriegsmarine--History.
Great Britain--Foreign relations--Germany.
Great Britain. Royal Navy--History.
World War, 1914-1918--Causes.