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U-6 (tàu ngầm Đức) (1935)Thực đơn
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WikiPedia: U-6 (tàu ngầm Đức) (1935) https://uboat.net/boats/u6.htm https://www.worldcat.org/issn/1231-014X https://www.google.com/books/edition/Der_U_Boot_Kr... https://www.google.com/books/edition/German_Warshi... https://www.google.com/books/edition/Die_deutschen... http://uboat.net/boats/u6.htm http://www.u-boot-archiv.de/dieboote/u0006.html