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- Land use--Planning57
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- Foreign trade regulation--United States37
- Veterans--United States33
- Outer space--Exploration32
- International relations26
- Education--United States22
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- Transportation--United States21
- Water resources development--Law and legislation--United States21
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- Parades16
- Indians of North America--United States13
- Banks and banking--United States11
- United States--Politics and government11
- Indians of North America--Culture9
- Energy policy--United States8
