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Donor
- Naff, Thomas 192
Topic
- Groundwater 192
- Agriculture 47
- Water quality 46
- Irrigation 42
- Watersheds 40
- Aquifers 39
- Hydrology 36
- Technology 36
- Water consumption 35
- Politics and government 29
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Rights
- In Copyright 192
Decade
- 1980-1989 192