Columbia subject headings:
Germany. Kriegsmarine--History--World War, 1939-1945.
Soviet Union. Voenno-Morskoĭ Flot--History--World War, 1939-1945.
World War, 1939-1945--Naval operations, German.
World War, 1939-1945--Naval operations, Soviet.
Harvard subject headings:
Germany. Kriegsmarine--History--World War, 1939-1945.
Soviet Union. Voenno-Morskoĭ Flot--History--World War, 1939-1945.
World War, 1939-1945--Naval operations, German.
World War, 1939-1945--Naval operations, Russian.
World War, 1939-1945--Naval operations, Soviet.
Princeton subject headings:
Germany. Kriegsmarine--History--World War, 1939-1945.
Soviet Union. Voenno-Morskoĭ Flot--History--World War, 1939-1945.
World War, 1939-1945--Naval operations, German.
World War, 1939-1945--Naval operations, Soviet.