ISBN 9780160502767 books & textbook
History of XV-15 Tilt Rotor Research Aircraft: From Concept to Flight (033-000-01223-3)
For sale by the U.S. G.P.O., Supt. of Docs /2000T Mass Market Paperback / 216 Pages
isbn-10: 0160502764 / isbn-13: 9780160502767
