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Subject
- Economic conditions43
- Mines and mineral resources33
- Gold mines and mining30
- History25
- Description and travel20
- Real property20
- Investments18
- Commerce14
- Silver mines and mining13
- Social life and customs12
- Businessmen11
- Politics and government11
- Mineral industries10
- Frontier and pioneer life9
- Indians of North America9
- Miners9
- Real estate investment9
- Authors, American8
- Gold discoveries8
- Gold miners8