"World War 1939-1945 secret service juvenile." . . "Guerre mondiale, 1939-1945 Déception (Science militaire) Ouvrages pour la jeunesse." . . "Espionage Juvenile literature." . . "Guerre mondiale, 1939-1945 Service secret Ouvrages pour la jeunesse." . . . . "Ultra hush hush" . . . . "The first title in this new series offers readers factual tales about an array of spy schemes used by various countries in an attempt to trick the enemy and win the war, enhanced with sidebars, historical photos, and color maps." . . "Provides an inside look at some of the real-life deceptions that turned the tide of World War II, describing the creative strategies that were used by all sides during the war." . . . . "Westerhof." . . . . . . . . "Ultra hush-hush : espionage and special missions" . "Ultra hush-hush : espionage and special missions"@en . "Espionage and spy missions" . "Ultra Hush-Hush" . . . . . . . . . . . . "Juvenile works"@en . . "Juvenile works" . . "Ultra hush-hush : espionage and spy missions" . . . "Guerre mondiale, 1939-1945 Cryptographie Ouvrages pour la jeunesse." . . "1939 - 1945" . . . .