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    Bomb trajectories

    Wilson, Edwin Bidwell | NTRS | 1920

    Effect of altitude on radiator performance

    James, W S / Parsons, S R | NTRS | 1920

    Duralumin

    Unger, E / Schmidt, E | NTRS | 1920

    The Steadiness Factor in Engine Sets

    Margoulis, W | NTRS | 1920

    Air flow through poppet valves

    Lewis, G W / Nutting, E M | NTRS | 1920

    Experimental Research on Air Propellers II

    Durand, William F / Lesley, E P | NTRS | 1920

    The Parker Variable Camber Wing

    Parker, H F | NTRS | 1920

    The Problem of the Helicopter

    Warner, E P | NTRS | 1920

    The dynamometer hub

    Stieber, W | NTRS | 1920