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U-12_(tàu_ngầm_Đức)_(1935)Thực đơn
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WikiPedia: U-12_(tàu_ngầm_Đức)_(1935) https://tools.wmflabs.org/geohack/geohack.php?lang... https://uboat.net/boats/u12.htm https://www.google.com/books/edition/Der_U_Boot_Kr... https://www.google.com/books/edition/German_Warshi... http://uboat.net/boats/u12.htm http://www.u-boot-archiv.de/dieboote/u0012.html http://www.opsi.gov.uk/si/si2008/uksi_20080950_en_...