Columbia subject headings:
Harvard subject headings:
Germany--History, Military--20th century.
Germany--History, Naval--20th century.
Germany. Heer.
Germany. Kriegsmarine.
World War, 1914-1918--Germany.
Princeton subject headings:
Germany--History, Military--20th century.
Germany--History, Naval--20th century.
World War, 1914-1918--Germany.