| Entry Text: | SHOWELL, J. P. M. U-Boats under the Swastika: An Introduction to German Submarines 1935–1945. 167p., bibliog., illus. London: Ian Allan, 1973. ISBN: 0711016828.
A good and well-illustrated account of the history, structure, and equipment of the U-boat arm. A second edition was published in 1987, substantially revised to take account of revelations on ULTRA. |
|---|