Columbia subject headings:
Germany. Kriegsmarine--History.
Suhren, Teddy.
World War, 1939-1945--Naval operations, German.
World War, 1939-1945--Naval operations--Submarine.
Harvard subject headings:
U 564 (Submarine)
World War, 1939-1945--Campaigns--Atlantic Ocean.
World War, 1939-1945--Campaigns--Caribbean Sea.
World War, 1939-1945--Naval operations, German.
World War, 1939-1945--Naval operations--Submarine.
World War, 1939-1945--Regimental histories--Germany.
Princeton subject headings: