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Subject
- Geology1,250
- Maps793
- Real property659
- Roads428
- Railroads356
- Mines and mineral resources342
- Land use, Rural341
- Coal212
- Administrative and political divisions197
- Groundwater177
- History170
- Nautical charts159
- Geology, Structural132
- Fire risk assessment124
- Geomagnetism123
- Landowners123
- Magnetic anomalies108
- Coasts101
- Geology, Stratigraphic101
- Campaigns95
