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- Meteorology86
- Climate22
- History17
- Meteorology and weather forecasting13
- Financial statements12
- Observations12
- Science12
- Federal receipts and expenditures11
- Precipitation (Meteorology)10
- Weather10
- Atmospheric pressure8
- Botany8
- Foreign trade7
- Great Britain. Parliament. House of Commons7
- United States. Department of Agriculture7
- United States. Department of Agriculture. Bureau of Animal Industry7
- United States. Weather Bureau7
- Agricultural research6
- Atmospheric temperature6
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