Title: Bletchley Park
Subjects: History, World War, 1939-1945, Cryptography, Electronic intellegence, Cryptographers, Biography, British Personal narratives, Weltkrieg, Funkaufklärung, Dechiffrierung, Great Britain. Government Communications Headquarters, Great Britain, World war, 1939-1945, great britain, World war, 1939-1945, personal narratives, british
Places: Great Britain, Bletchley Park
People: James W. Thirsk