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Donor
- Naff, Thomas 237
- Kolars, John F. 1
Topic
- Groundwater 243
- Agriculture 62
- Irrigation 57
- Water quality 57
- Technology 46
- Hydrology 45
- Watersheds 45
- Aquifers 43
- Water consumption 42
- Politics and government 36
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Rights
- In Copyright 243
Decade
- 1980-1989 243