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Subject
- Description and travel74
- History42
- International relations30
- Foreign trade28
- Mines and mineral resources24
- Treaties20
- Territories and possessions19
- Exports17
- Boundaries16
- Tariffs and duties16
- Imports15
- Travel15
- Conferences13
- Foreign laws13
- Indians of South America13
- Railroads13
- Discovery and exploration12
- Interoceanic canals12
- Neutrality12
- Spanish-owned territories12