BOOK SALES

To purchase, please see the links, below.

Gordon Welchman: Bletchley Park's Architect of Ultra Intelligence (Frontline Books)

Paperback

Hardback

Alastair Denniston: Code-breaking from Room 40 to Berkeley Street and the Birth of GCHQ (Frontline Books)

Hardback

The Turing Guide, Chapter 10, The Enigma Machine (OUP)

Hardback

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