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    Aeronautics--Research (4)
    Aeronautics--Systems engineering (4)
    Airplanes--Design and construction (4)
    Airplanes--Materials--Testing (1)
    Airplanes--Parts--Testing (4)
    Airplanes--Wings (4)
    Duralumin--Testing (1)
    Steel--Testing (1)
    Strains and stresses (4)
    Strength of materials (4)