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Start Over You searched for: Author Aeronautics Branch Remove constraint Author: Aeronautics Branch Catalog Issue Year Decade 1930 - 1939 Remove constraint Catalog Issue Year Decade: 1930 - 1939

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192. Aviation training.

195. Noise. Reduction of airplane noise.

196. Air traffic rules.

198. Engines. Aircraft engine testing.

199. Gliders and gliding.