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Subject
- History297
- Discovery and exploration269
- Explorers134
- Description and travel83
- Travel60
- Discoveries in geography42
- Scientific expeditions34
- Frontier and pioneer life27
- British26
- French24
- Lewis and Clark Expedition20
- Natural history19
- Indians of North America18
- Russian17
- Territorial expansion17
- Colonies16
- Colonization16
- Fur trade16
- History and criticism15
- Social life and customs13