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- Gold mines and mining[remove]14
- Description and travel9
- Gold discoveries7
- Voyages to the Pacific coast7
- Frontier and pioneer life5
- Social life and customs5
- Indians of North America4
- Politics and government4
- Coal mines and mining3
- Commerce3
- Fur trade3
- Lumber trade3
- Mines and mineral resources3
- Missionaries3
- Overland journeys to the Pacific3
- Voyages and travels3
- Ocean travel2
- Canals1
- Capital and capitol1
- Fortification1
