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Start Over You searched for: Publish Year Decade 1930 - 1939 Remove constraint Publish Year Decade: 1930 - 1939 Sudoc Stem C 23.11 Remove constraint Sudoc Stem: C 23.11

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11. Airways. Federal airways system.

12. Aviation training.

14. Civil aeronautics in United States.

16. Airports. Airport design and construction.