Enigma U-boats: Breaking the Code
by Jak P Mallmann Showell
ISBN 13: 9780711027640
Format: Hardcover (192 pages) Publisher: Ian Allan Publishing Published: 29 Jul 2000
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German Naval Code Breakers
ISBN 13: 9780711028883
Format: Hardcover (160 pages) Publisher: Ian Allan Publishing Published: 15 May 2003