Enigma U-boats: Breaking the Code - the True Story
by Showell Jak P. Mallmann
ISBN 13: 9780711033962
Format: Paperback (232 pages) Publisher: Ian Allan Ltd Published: 02 Jul 2009
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U-boats of the Second World War: Their Longest Voyages
ISBN 13: 9781781551028
Format: Hardcover (224 pages) Publisher: Fonthill Media Published: 11 Dec 2013