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U-boat Ubort Ubatã Ubaté U bắt mọi Ubá (tiểu vùng)Tài liệu tham khảo
WikiPedia: U-boat http://www.karldoenitz.com http://www.one35th.com/submarine/molch_main.htm http://www.subsim.com/ http://www.third-reich-books.com/x-593-u-boat-atta... http://www.U-35.com http://www.U-434.com http://www.uboat-bases.com/ http://www.uboat-bases.com/en/ http://www.uboataces.com http://www.historisches-centrum.de/index.php?id=41...