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Subject
- Description and travel802
- History651
- Frontier and pioneer life239
- Indians of North America225
- Discovery and exploration193
- Exploring expeditions172
- Territorial expansion153
- Overland journeys to the Pacific150
- Travel74
- Economic conditions71
- Pioneers63
- Social life and customs59
- Explorers58
- History and criticism58
- Politics and government58
- Wars56
- Railroads55
- Lewis and Clark Expedition54
- Hunting48
- In literature47