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WikiPedia: Tàu_ngầm_lớp_I-400 http://www.combinedfleet.com/I-400.htm http://www.combinedfleet.com/I-401.htm http://www.combinedfleet.com/sen_toku.htm http://www.damninteresting.com/?p=31 http://www.militaryhistoryonline.com/wwii/articles... http://starbulletin.com/2005/03/20/news/story1.htm... http://ww2db.com/ship_spec.php?ship_id=452 http://ww2db.com/ship_spec.php?ship_id=453 http://ww2db.com/ship_spec.php?ship_id=454 http://ww2db.com/ship_spec.php?ship_id=S451