. . . . . . . . . "Intelligence and cryptanalytic activities of the British Navy in World War I : the code breakers of Room 40"@en . . "Intelligence and cryptanalytic activities of the British Navy in world war 1. : the code breakers of room 40" . . . . . . "Intelligence and cryptanalytic activities of the British navy in World War I : the code breakers of Room 40"@en . . "Intelligence and cryptanalytic activities of the British navy in World War I : the code breakers of room 40" . "Code breakers of room 40"@en . . .