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- Geology7,343
- Real property3,373
- History3,085
- Roads2,865
- Soils2,860
- Maps2,082
- Soil surveys2,068
- Railroads1,781
- Historical geography1,598
- Description and travel1,473
- Administrative and political divisions1,444
- Mines and mineral resources1,250
- Navigation1,215
- Nautical charts1,210
- Harbors1,031
- Land use, Rural804
- Landowners744
- Cartography714
- Population714
- Economic conditions666