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Subjects
Natural resources
4
Conservation of natural resources
2
Ecology
2
Economic history
2
Nuclear warfare
2
Pollution
2
Strategic materials
2
Concentration camps
1
Dams
1
Economic development
1
Economic forecasting
1
Energy policy
1
Environmental policy
1
Environmental protection
1
Food supply
1
Forced labor
1
Geopolitics
1
Industrialization
1
Industries
1
Mines and mineral resources
1