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- History 3,511
- Social conditions 1,004
- Politics and government 972
- Social life and customs 703
- Race relations 596
- Description and travel 435
- Ethnic relations 430
- African Americans 398
- Antiquities 394
- Social aspects 303
- Frontier and pioneer life 285
- Economic conditions 265
- Civilization 261
- Immigrants 220
- Ethnic identity 208
- Emigration and immigration 202
- Mayas 182
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- Excavations (Archaeology) 172
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- Jews 138
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