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- Gold mines and mining[remove]46
- Gold discoveries20
- Miners18
- Gold miners11
- Description and travel9
- Mines and mineral resources9
- Voyages to the Pacific coast8
- Frontier and pioneer life7
- Indians of North America6
- Social life and customs5
- Lumber trade4
- Politics and government4
- Coal mines and mining3
- Commerce3
- Fur trade3
- Missionaries3
- Overland journeys to the Pacific3
- Voyages and travels3
- Chinese2
- Gambling2