Bletchley Park and D-Day : the untold story of how the battle for Normandy was won /
Kenyon, David,author.https://isni.org/isni/0000000055062787.
Originally published: 2019.
Great Britain. Government Communications Headquarters.
Great Britain. Government Communications Headquarters.
World War, 1939-1945
World War, 1939-1945
Cryptography
Cryptography.
Electronic intelligence.