Columbia subject headings:
Harvard subject headings:
Germany--History, Naval--19th century.
Germany--History, Naval--20th century.
Germany. Kriegsmarine--History.
World War, 1914-1918--Naval operations, German
World War, 1939-1945--Naval operations, German.
Princeton subject headings:
Germany--History, Naval--19th century.
Germany--History, Naval--20th century.
Germany. Kriegsmarine--History.
World War, 1914-1918--Naval operations, German.
World War, 1939-1945--Naval operations, German.