Written for the British Admiralty by Fregattenkapitän Günter Hessler, who was given free access to war diaries and other primary sources. Includes corrections and explanations not found in the original text. The many charts and diagrams pinpoint the deployment of each U-boat on any particular day.-- From the publisher information on slipcase.

At head of title: Ministry of Defence (Navy) Contains 5 folded sheets of diagrams in separate wallet, aka volume 2. In slipcase. Compiled by Günter Hessler from war diaries and primary sources of the German Navy.

Book : The U-boat war in the Atlantic, 1939-1945 -- Five sheets incorporating diagrams 1-32 from the original volumes.