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WikiPedia: Type II (lớp tàu ngầm) https://commons.wikimedia.org/wiki/Category:German... https://archive.today/20160304195033/http://www.du... http://www.dutchsubmarines.com/export/export_ivs.h... http://www.uboataces.com/uboat-type-ii.shtml http://webarchive.loc.gov/all/20080216095636/http:... https://www.telegraph.co.uk/news/main.jhtml;?xml=/...