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WikiPedia: Cachalot (lớp tàu ngầm) http://books.google.com/?id=bJBMBvyQ83EC http://www.navweaps.com/Weapons/WNUS_3-50_mk10-22.... http://pigboats.com/subs/v-boats4.html http://www.navy.mil/navydata/cno/n87/usw/issue_20/... http://www.navsource.org/archives/08/04idx.htm //www.worldcat.org/oclc/18121784 https://web.archive.org/web/20140322093118/http://... https://web.archive.org/web/20150304052224/http://... https://commons.wikimedia.org/wiki/Category:Cachal...