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- Description and travel[remove]123,325
- History17,205
- Travel15,270
- Social life and customs7,635
- Politics and government2,497
- Economic conditions2,467
- Natural history2,073
- Indians of North America2,002
- Voyages and travels1,815
- Social conditions1,783
- Antiquities1,777
- Missions1,758
- Civilization1,441
- Discovery and exploration1,350
- Homes and haunts1,184
- Agriculture1,161
- Foreign relations1,117
- History and criticism990
- Frontier and pioneer life879
- Overland journeys to the Pacific858