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- Indians of North America--Oklahoma95
- Indians of North America--United States95
- Education--United States63
- Land use--Planning50
- Indians of North America--Claims44
- United States--Armed Forces40
- Foreign trade regulation--United States39
- Veterans--United States34
- Outer space--Exploration30
- International relations28
- Speeches, addresses, etc.21
- Science20
- Banks and banking--United States19
- Parades17
- Water resources development--Law and legislation--United States16
- Aerospace engineering15
- Transportation--United States15
- Vietnam War, 1961-197515
- Indians of North America--Culture11
- Prisoners of war11
