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WikiPedia: I-61 (tàu ngầm Nhật) http://www.combinedfleet.com/type_kd4.htm http://www.combinedfleet.com/KisoM_t.htm http://www.ijnsubsite.info/I-Sub%20Details/I-61.ht... https://archive.org/details/submarinesofworl0000ba... https://archive.org/details/conwaysallworlds1922un... https://archive.org/details/chronologyofwara0000ro... https://www.ijnsubsite.info/I-Sub%20Details/I-162.... https://www.ijnsubsite.info/I-Sub%20Details/I-156.... https://www.ijnsubsite.info/I-Sub%20Details/I-157.... https://www.ijnsubsite.info/I-Sub%20Details/I-158....