Duitse Enigma cijfermachine in de collectie van het Koninklijk Legermuseum: militair gebruik, werking en geschiedenis van het Enigma code breken By air to battle : the official account of the British first and sixth Airborne Divisions / prepared for the Air Ministry by the Ministry … Tracing your army ancestors / Simon Fowler world war ii from original sources By air to battle : The Official History of the British Paratroops in World War II / edited and introduced by Bob Carruthers