Hitler's secret service - Schellenberg, Walter 1910-1952.; Hagen, Louis (New York Pyramid Books, 1958)
Title cover: The fascinating true story of Hitler's secret service
Original title: The Labyrinth
Keywords: World War, 1939-1945 -- Secret service -- Germany; Military intelligence -- History -- 20th. -- Germany; Nazis -- Biography; Intellligence officers -- Germany -- Biography