Explore Books on
ultra (intelligence system)

Enigma

By Władysław Kozaczuk

The emperor's codes

By Michael Smith

The U-boat war, 1939-1945

By Ian Baxter

Ultra's Arctic war

By John Jackson

Ultra and the Army Airforces in World War II

By Lewis F. Powell

The German Enigma cipher machine

By David Kahn

XIX Tactical Air Command and ULTRA

By Bradford J. Shwedo

The Ultra secret

By Frederick William Winterbotham

Secret allies in the Pacific

By Roland H. Worth

Delusions of intelligence

By R. A. Ratcliff

The emperor's codes

By Michael Smith

Code wars

By John Jackson

ULTRA 1ntelligence e macchine ENIGMA nella guerra di Spagna 1936-1939

By Alberto Santoni

The secret capture

By Stephen Wentworth Roskill

Chiffriermaschinen und Entzifferungsgeräte im Zweiten Weltkrieg

By Michael Pröse