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North American P-51 Mustang North Carolina (lớp thiết giáp hạm) North American F-86 Sabre Northrop Grumman B-2 Spirit Northrop F-5 Northrop Grumman RQ-4 Global Hawk North American B-25 Mitchell Northrop P-61 Black Widow North American F-100 Super Sabre North Bucks & District Football LeagueTài liệu tham khảo
WikiPedia: Northrop_X-21 http://aeroweb.brooklyn.cuny.edu/specs/northrop/x-... http://users.dbscorp.net/jmustain/x21.htm http://www.globalsecurity.org/military/systems/air... https://commons.wikimedia.org/wiki/Category:Northr...