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Subject
- Geology6
- Geomagnetism4
- Coasts2
- Magnetic anomalies2
- Mines and mineral resources2
- Administrative and political divisions1
- Artesian wells1
- Coaching (Transportation)1
- Counties1
- Forests and forestry1
- Gold ores1
- Gravel1
- Highway planning1
- Historical geography1
- Hunting1
- Maps1
- Nautical charts1
- Navigation1
- Outdoor recreation1
- Plantations1
