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- Geology7,543
- Real property3,377
- History3,347
- Roads3,245
- Soils2,871
- Maps2,408
- Soil surveys2,068
- Railroads1,808
- Historical geography1,751
- Description and travel1,551
- Administrative and political divisions1,525
- Mines and mineral resources1,282
- Nautical charts1,246
- Navigation1,243
- Harbors1,055
- Land use, Rural810
- Population774
- Cartography763
- Landowners745
- Economic conditions724