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    The new world of helicopters

    Delear, F.J. | TIBKAT | 1978

    The Helicopter : its importance to commerce and to the public

    Davis, A. N. / Richardson, R. A. / Helicopter Association of America | TIBKAT | 1978

    Vertical Flight : the age of the helicopter

    Boyne, W. J. / Lopez, D. S. | TIBKAT | 1984

    Helicopter performance, stability, and control

    Prouty, Raymond W. | TIBKAT | 1986

    Helicopters of the world

    Taylor, M.J.H. / Taylor, J.W.R. | TIBKAT | 1978

    Igor Sikorsky : his three careers in aviation

    Delear, Frank J. | TIBKAT | 1969

    The aviation careers of Igor Sikorsky

    Cochrane, Dorothy / Hardesty, Von / Lee, Russell et al. | TIBKAT | 1989

    Igor Sikorsky; his three careers in aviation

    Delear, Frank J. | TIBKAT | 1976