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- Geology7,170
- Real property3,320
- Roads2,843
- Soils2,604
- History2,102
- Soil surveys1,898
- Railroads1,675
- Maps1,306
- Navigation1,200
- Mines and mineral resources1,198
- Description and travel1,143
- Administrative and political divisions1,133
- Nautical charts1,015
- Harbors1,006
- Historical geography952
- Land use, Rural778
- Landowners737
- Fire risk assessment662
- Population604
- Groundwater574