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- Education2,705
- Medical care2,607
- Indians of North America2,475
- Taxation2,416
- Employment2,414
- Legal status, laws, etc2,364
- Population2,352
- Testing2,342
- Small business2,310
- Study and teaching2,280
- Older people2,219
- Agriculture2,182
- International cooperation2,116
- Water2,108
- Evaluation2,076
- Commerce2,052
- Airplanes2,031
- Soil surveys2,024
- Groundwater1,994
- Mathematical models1,890