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Subject
- Maps35
- Discovery and exploration22
- Geology22
- History21
- Discoveries in geography18
- British17
- Colonies16
- Coasts15
- Indians of North America12
- Russian12
- Railroads6
- French5
- Gravity anomalies5
- Nautical charts4
- Navigation4
- Administrative and political divisions3
- Discovery and exploration, Russian3
- Geomagnetism3
- Geothermal resources3
- Natural gas3
