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- Indians of North America--Oklahoma42
- Foreign trade regulation--United States39
- United States--Armed Forces39
- Land use--Planning37
- Veterans--United States34
- Outer space--Exploration29
- International relations26
- Speeches, addresses, etc.25
- Indians of North America--Claims19
- Science19
- Parades16
- Aerospace engineering14
- Water resources development--Law and legislation--United States12
- Indians of North America--Culture11
- United States--Politics and government11
- Constituents' communication with members of the U.S. Congress10
- Courts--United States10
- Transportation--United States10
- Campaign management--United States8
- Political campaigns--United States8
