The ultra secret /
Winterbotham, F.W.
The ultra secret / [By] F.W. Winterbotham, CBE. - New York : Harper & Row, [1974]. - xiii, 199 p. ; ill. ; 21 cm. - 351.74(42)+003.26 (NLA) .
Includes index
006-014678-8
World War, 1939-1945--Cryptography
World War, 1939-1945--Secret service--Great Britain
World War, 1939-1945 --Personal narratives, English.
351.74(42)+003.26 (NLA)
The ultra secret / [By] F.W. Winterbotham, CBE. - New York : Harper & Row, [1974]. - xiii, 199 p. ; ill. ; 21 cm. - 351.74(42)+003.26 (NLA) .
Includes index
006-014678-8
World War, 1939-1945--Cryptography
World War, 1939-1945--Secret service--Great Britain
World War, 1939-1945 --Personal narratives, English.
351.74(42)+003.26 (NLA)