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Subject
- Geology96
- Land use, Rural47
- Real property22
- Mines and mineral resources20
- Geomagnetism16
- Magnetic anomalies12
- Navigation12
- Harbors11
- Railroads11
- Land use10
- Coasts9
- Coastal ecology7
- Groundwater7
- Forests and forestry6
- Nautical charts6
- Outdoor recreation6
- Administrative and political divisions5
- Landowners5
- Roads5
- Sediments (Geology)5
