The U-boat: The Evolution & Technical History of German Submarines by Eberhard Rossler.
Out of print since the last 2001 Cassell UK edition.
Still in stock in NEW condition at: http://www.sonic.net/~books
or email to: books(at)sonic.net
THE U-BOAT: The Evolution and Technical History of German Submarines Cassell 2001 A massive and authoritative history of the planning, design, and construction of the German submarine force from the experimental types of the 19th century, through two world wars, to the modern submarines of the German Federal Navy. Describes every class of U-boat that entered service as well as many of the experimental craft that were still in development at the end of WWII. Comprehensive and long considered to be the definitive reference to German U boat design and development. Large 10"x10", photos, line drawings, diagrams, deck plans, 60+ data tabulations, charts, app., 384 pages. Revised and updated edition.