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- Description and travel✖[remove]76,537
- History9,589
- Travel8,700
- Social life and customs5,041
- Politics and government1,813
- Economic conditions1,789
- Indians of North America1,688
- Natural history1,594
- Missions1,343
- Voyages and travels1,189
- Social conditions1,130
- Agriculture1,060
- Antiquities1,005
- Discovery and exploration951
- Frontier and pioneer life856
- Foreign relations851
- Overland journeys to the Pacific822
- Civilization614
- Hunting594
- Gold discoveries572