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- History6,840
- Description and travel4,051
- Law and legislation2,041
- Gold discoveries1,885
- Indians of North America1,798
- Environmental aspects1,577
- Politics and government1,577
- Water-supply1,574
- Geology1,504
- Social conditions1,098
- Social life and customs1,089
- Agriculture1,073
- Gold mines and mining1,037
- Water resources development1,021
- Mines and mineral resources993
- Groundwater890
- Economic conditions854
- Legislative amendments850
- Real property783
- Finance761