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Type II submarine - Wikipedia
Type II U-Boats (1935) - Naval Encyclopedia
Type UB II submarine - Wikipedia
List of German Type II submarines - Wikipedia
German Type II U-Boat - history, specification and photos
Type II - Deutsches U-Boot-Museum
Type II U-Boat - WW2Ships
Typ II - German Navy
U-boat | German Submarine Warfare in WWI & WWII | Britannica
U-boat Types - German U-boats of WWII - Kriegsmarine
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