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- Social aspects15,537
- Presidents15,096
- History and criticism14,738
- Officials and employees14,098
- Medical care13,809
- Women13,704
- Evaluation13,251
- States12,795
- Description and travel11,925
- Railroads11,815
- Race relations11,805
- Study and teaching11,768
- Employment10,857
- Political aspects10,778
- Civil rights10,448
- Commerce10,442
- National security10,262
- Economic policy10,185
- Budget10,063
- World War, 1939-19459,887