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WikiPedia: Type VII (lớp tàu ngầm) https://web.archive.org/web/20080409052122/http://... http://www.navy.mil/navydata/cno/n87/history/wwii-... https://www.uboat.net/types/viic.htm https://www.uboat.net/types/viia.htm https://www.uboat.net/types/viib.htm https://www.uboat.net/technical/flak.htm https://www.uboat.net/types/viid.htm https://www.uboat.net/types/viif.htm https://www.uboataces.com/uboat-type-vii.shtml http://worldcat.org/oclc/894127110