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U-2_(tàu_ngầm_Đức)_(1935)Thực đơn
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WikiPedia: U-2_(tàu_ngầm_Đức)_(1935) https://tools.wmflabs.org/geohack/geohack.php?lang... http://www.wlb-stuttgart.de/seekrieg/verluste/ausl... https://uboat.net/boats/u2.htm 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/u2.htm http://www.u-boot-archiv.de/dieboote/u0002.html