Columbia subject headings:
Harvard subject headings:
Christmann, Richard, 1905-
Germany. Bundesnachrichtendienst--Officials and employees--Biography.
Spies--Germany--Biography.
World War, 1939-1945--Secret service--Germany.
Princeton subject headings:
Christmann, Richard, 1905-
Espionage--Germany.
Germany. Bundesnachrichtendienst
World War, 1939-1945--Secret service--Germany.