ULTRA (Intelligence system)

The emperor's codes: Bletchley Park and the breaking of Japan's secret ciphers

Michael Smith.

Enigma: how the German machine cipher was broken, and how it was read by the Allies in World War Two

Władysław Kozaczuk ; edited and translated by Christopher Kasparek.

Ultra's Arctic war

by John Jackson

Code wars: how 'ultra' and 'magic' led to Allied victory

John Jackson

The German Enigma cipher machine

[edited by] Brian J. Winkel ... [et al.].

The U-boat war, 1939-1945: rare photographs from wartime archives

Ian Baxter.

The secret capture

S.W. Roskill ; new introduction by Barry Gough ; new foreword by Charles Baker-Cresswell

ULTRA and the Army Air Forces in World War II: an interview with Associate Justice of the U.S. Supreme Court Lewis F. Powell, Jr.

edited with an introduction and essay by Diane T. Putney.

The emperor's codes: the breaking of Japan's secret ciphers

Michael Smith

Secret allies in the Pacific: covert intelligence and code breaking cooperation between the United States, Great Britain, and other nations prior to the attack on Pearl Harbor

by Roland H. Worth, Jr.