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WikiPedia: I-181 (tàu ngầm Nhật) https://www.ijnsubsite.info/I-Sub%20Details/I-181.... http://www.combinedfleet.com/I-181.htm https://www.fold3.com/image/272049566 https://archive.org/details/submarinesofworl0000ba... https://archive.org/details/conwaysallworlds1922un...