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- Description and travel29
- Overland journeys to the Pacific12
- Frontier and pioneer life7
- Geology7
- Exploring expeditions6
- Natural history6
- Paleontology6
- Birds5
- Explorations and surveys5
- Indians of North America5
- Pacific railroads5
- Gold discoveries3
- Agriculture2
- Buena Vista, Battle of, Mexico, 18472
- Discovery and exploration2
- Gold mines and mining2
- History2
- Mexican War, 1846-18482
- Mines and mineral resources2
- Ocean travel2