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U-7_(tàu_ngầm_Đức)_(1935)Thực đơn
U-7_(tàu_ngầm_Đức)_(1935)Liên quan
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WikiPedia: U-7_(tàu_ngầm_Đức)_(1935) https://uboat.net/boats/u7.htm http://uboat.net/boats/successes/u7.html http://uboat.net/boats/u7.htm https://tools.wmflabs.org/geohack/geohack.php?lang... https://tools.wmflabs.org/geohack/geohack.php?lang... https://www.google.com/books/edition/Der_U_Boot_Kr... https://www.google.com/books/edition/German_Warshi... http://www.u-boot-archiv.de/dieboote/u0007.html