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

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42. Airport design and construction.

43. Airway maps. Air navigation maps.

44. Civil aeronautics in United States.

47. Medical examiners of Aeronautics Branch.