Columbia subject headings:
Germany--History, Naval--20th century.
Germany. Kriegsmarine--History--20th century.
Great Britain--History, Naval--20th century.
Great Britain. Royal Navy--History--20th century.
Military planning--Germany--History--20th century.
Military planning--Great Britain--History--20th century.
Naval strategy--History--20th century.
Harvard subject headings:
Germany--History, Naval--20th century.
Germany. Kriegsmarine--History--20th century.
Germany. Kriegsmarine.
Great Britain--History, Naval--20th century.
Great Britain. Royal Navy
Great Britain. Royal Navy--History--20th century.
Military planning--Germany--History--20th century.
Military planning--Great Britain--History--20th century.
Naval strategy--History--20th century.
Princeton subject headings:
Germany--History, Naval--20th century.
Germany. Kriegsmarine--History--20th century.
Great Britain--History, Naval--20th century.
Great Britain. Royal Navy--History--20th century.
Military planning--Germany--History--20th century.
Military planning--Great Britain--History--20th century.
Naval strategy--History--20th century.