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- History✖[remove]78,089
- Politics and government8,877
- Social conditions3,995
- Social life and customs3,608
- Description and travel3,213
- Race relations2,449
- Frontier and pioneer life2,044
- Economic conditions1,821
- Indians of South America1,712
- African Americans1,711
- Civilization1,567
- Foreign relations1,532
- Antiquities1,497
- Ethnic relations1,440
- Emigration and immigration1,242
- Indians of Mexico1,172
- Indians of North America1,161
- Immigrants1,115
- Colonies1,077
- Social aspects955