Columbia subject headings:
Harvard subject headings:
Finland--History--1939-1945
Finland--Relations--Soviet Union.
Intelligence service--Finland--History--20th century.
Intelligence service--Soviet Union--History
Soviet Union--Relations--Finland.
World War, 1939-1945--Secret service--Finland.
World War, 1939-1945--Secret service--Soviet Union
Princeton subject headings:
Finland--History--1939-1945.
Finland--Relations--Soviet Union.
Intelligence service--Finland--History.
Intelligence service--Soviet Union--History.
Soviet Union--Relations--Finland.