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Normal
Hi,http://books.google.com.eg/books?id=a-QDAAAAMBAJ&pg=RA1-PA56&dq=sikorsky+vertical+takeoff&hl=ar&ei=4lwbTNvYEYeT4gbvs5XaCg&sa=X&oi=book_result&ct=result&resnum=4&ved=0CDYQ6AEwAw#v=onepage&q=sikorsky%20vertical%20takeoff&f=true
Hi,
http://books.google.com.eg/books?id=a-QDAAAAMBAJ&pg=RA1-PA56&dq=sikorsky+vertical+takeoff&hl=ar&ei=4lwbTNvYEYeT4gbvs5XaCg&sa=X&oi=book_result&ct=result&resnum=4&ved=0CDYQ6AEwAw#v=onepage&q=sikorsky%20vertical%20takeoff&f=true
