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Subject
- World War, 1939-194513
- Occupied territories6
- Campaigns5
- Forest reserves4
- Forests and forestry2
- Geology2
- Recreation areas2
- Bolivia1
- Climate1
- Coasts1
- Economic conditions1
- Emgration and immigration1
- Fisheries1
- History1
- Military aspects1
- Natural gas1
- Nautical charts1
- Oil fields1
- Pan American Highway System1
- Politics and government1
