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Subject
- United States. Civil Aeronautics Board51
- United States Civil Service Commission41
- Aeronautics, Commercial23
- Civil service20
- Law and legislation15
- Officials and employees15
- Civilization13
- Civil defense12
- Airlines9
- Appointments, promotions, salaries, etc9
- Aeronautics6
- Appropriations and expenditures6
- Rates6
- Study and teaching6
- United States6
- United States. Civil Air Patrol6
- History5
- United States. Civil Aeronautics Authority5
- Consumer protection4
- Employment4