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- Agriculture 20
- Irrigation 18
- Politics and government 14
- Economics 10
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- Watersheds 9
- Precipitation (Meteorology) 8
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- Soviet Union 6
- Bureaucracy 5
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Publisher
- United States. Joint Publications Research Service 7
- Food and Agriculture Organization of the United Nations 6
- Trud 3
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Decade
- 1970-1979 46
