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U-11_(tàu_ngầm_Đức)_(1935)Thực đơn
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WikiPedia: U-11_(tàu_ngầm_Đức)_(1935) https://uboat.net/boats/u11.htm https://www.google.com/books/edition/Der_U_Boot_Kr... https://www.google.com/books/edition/German_Warshi... http://uboat.net/boats/u11.htm http://www.u-boot-archiv.de/dieboote/u0011.html