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North American P-51 Mustang North Carolina (lớp thiết giáp hạm) Northrop Grumman B-2 Spirit Northrop F-5 North American F-86 Sabre Northrop Grumman RQ-4 Global Hawk North American B-25 Mitchell Northrop P-61 Black Widow Northern Premier League 2014–15 North American F-100 Super SabreTài liệu tham khảo
WikiPedia: North_American_XB-70_Valkyrie http://books.google.ca/books?id=1V_fAAAAMAAJ http://books.google.ca/books?id=v0QEAAAAMBAJ&pg=PA... http://www.amazon.com/dp/0933424752 http://books.google.com/books?id=2ppC_VU6WrUC&pg=P... http://books.google.com/books?id=CEb1sFobGgcC&pg=P... http://www.history.com/media.do?action=clip&id=mf6... http://www.learnworld.com/ZNW/LWText.York.RaceToOb... http://www.youtube.com/watch?v=RYgCDzKp2KI http://www.foia.cia.gov/docs/DOC_0000645397/DOC_00... http://www.dfrc.nasa.gov/Gallery/Movie/XB-70/index...