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- Meteorology and weather forecasting108
- Meteorology59
- Research48
- United States. Weather Bureau45
- Precipitation (Meteorology)42
- Legislative amendments41
- Meteorological stations37
- Meteorological satellites35
- Meteorology in aeronautics35
- International cooperation33
- Measurement23
- Meteorological services22
- Weather forecasting22
- Rain and rainfall20
- Federal aid to research18
- Climate17
- Cost16
- Law and legislation15
- United States. War Dept. Office of the Chief Signal Officer15
- Weather15