Columbia subject headings:
Harvard subject headings:
Military intelligence--Soviet Union--History.
Official secrets--Soviet Union.
Security classification (Government documents)--Soviet Union--History.
Soviet Union. Glavnoe upravlenie po delam literatury i izdatelʹstv--History.
World War, 1939-1945--Military intelligence--Soviet Union.
Princeton subject headings:
Military intelligence--Soviet Union--History.
Official secrets--Soviet Union.
Security classification (Government documents)--Soviet Union--History.
World War, 1939-1945--Military intelligence--Soviet Union.