| by Rössler, Eberhard (U-boat Type XXI) 2001, Bernard & Graefe Verlag, Koblenz ISBN 3763762183 Anatomy of the Type XXI U-boat with lots of scale line drawings. |
Translations of this title include:
| by Kohl, Fritz & Rössler, Eberhard 1991, Conway Maritime Press ISBN 1557508291 Anatomy of the Type XXI U-boat with lots of scale line drawings. | |
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