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Boeing_247 Tham khảoLiên quan
Boeing 247 Boeing 747 Boeing 747-400 Boeing 747 Large Cargo Freighter Boeing 747-8 Boeing 747SPTài liệu tham khảo
WikiPedia: Boeing_247 http://www.acepilots.com/pioneer/boeing_247.html http://www.boeing.com/history/boeing/m247.html http://books.google.com/books?id=2zTueJhXW0QC&pg=P... http://books.google.com/books?id=YeIDAAAAMBAJ&pg=P... http://books.google.com/books?id=td4DAAAAMBAJ&pg=P... http://www.airminded.net/b247/boe247.html http://worldcat.org/oclc/11569612