Peron era / by Robert J. Alexander Mental tests in the American army / compiled and ed. by Clarence S. Yoakum and Robert M. Yerkes Dragonflies; The Story of Helicopters and Autogiros Combat Aircraft Prototypes since 1945 sky their frontier : the Story of the World's Pioneer Airlines and Routes 1920-1940 Fighter aces of world war II : the true stories of fourteen of world war II's top fighter pilots Air War over Korea great pan navy's here / Willi Frischauer and Robert Jackson Air war over Korea / [by] Robert Jackson grote luchtgevechten / Robert Jackson ; [vert. uit het Engels door T. Wesselink ; woord vooraf door Alan Clark] Arnhem : the Battle remembered / Robert Jackson
