00676nam a22002052 4500 0000020236 20140825165156.0 110816s1974 xx 000 0 eng d 0297768328 PUL Winterbotham, F. W, 1897- Frederick William. The Ultra secret / F. W. Winterbotham. London : Weidenfeld and Nicolson, 1974. xiii, 199 p. ; 23 cm. World War, 1939-1945 | Cryptography. World War, 1939-1945 Secret service Great Britain. World War, 1939-1945 Personal narratives, British. 110816 D810.C88 W56 1976 19391 19391 0 0 lcc 0 0 NFIC PUEA PUEA GEN 2012-12-26 0 D810.C88 W56 1976 140020000180 2012-12-26 00:00:00 2012-12-26 BK 0 0 lcc 0 0 NFIC PUEA PUEA GEN 2013-02-25 0 D810.C88 W56 1976 020020003354 2013-02-25 00:00:00 2013-02-25 BK