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- History44,156
- Operas25,861
- Politics and government22,773
- Jazz21,049
- Economic conditions17,226
- Periodicals15,169
- Piano music15,068
- Feature films14,511
- Popular music14,480
- Symphonies13,059
- Music12,257
- Study and teaching9,727
- Geology9,552
- World War, 1939-19458,974
- Women8,973
- Law and legislation8,695
- Social life and customs8,681
- Social conditions8,586
- Orchestral music8,501
- Education8,171