Columbia subject headings:
Military intelligence--Soviet Union--History.
Soviet Union. Voenno-Morskoĭ Flot.
World War, 1939-1945--Naval operations.
World War, 1939-1945--Secret service--Soviet Union.
Harvard subject headings:
Military intelligence--Soviet Union--History.
Soviet Union. Voenno-Morskoĭ Flot.
World War, 1939-1945--Naval operations.
World War, 1939-1945--Secret service--Soviet Union.
Princeton subject headings: