Columbia subject headings:
Harvard subject headings:
Espionage, Soviet--Japan--History--Congresses.
Sorge, Richard, 1895-1944--Congresses.
World War, 1939-1945--Secret service--Soviet Union--Congresses.
Princeton subject headings:
Espionage, Soviet--Japan--History--Congresses.
Sorge, Richard, 1895-1944--Congresses.
World War, 1939-1945--Secret service--Soviet Union--Congresses.