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- Geology7,545
- Real property3,377
- History3,354
- Roads3,246
- Soils2,871
- Maps2,408
- Soil surveys2,068
- Railroads1,808
- Historical geography1,753
- Description and travel1,553
- Administrative and political divisions1,525
- Mines and mineral resources1,282
- Nautical charts1,246
- Navigation1,243
- Harbors1,055
- Land use, Rural810
- Population777
- Cartography766
- Landowners745
- Economic conditions726