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- Geology7,545
- History3,387
- Real property3,377
- Roads3,245
- Soils2,871
- Maps2,417
- Soil surveys2,068
- Railroads1,808
- Historical geography1,759
- Description and travel1,553
- Administrative and political divisions1,525
- Mines and mineral resources1,282
- Nautical charts1,248
- Navigation1,243
- Harbors1,056
- Land use, Rural810
- Population777
- Cartography769
- Landowners745
- Economic conditions727