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Donor
- Naff, Thomas 237
Topic
- Groundwater 237
- Agriculture 62
- Water quality 55
- Irrigation 52
- Technology 46
- Aquifers 43
- Hydrology 43
- Watersheds 43
- Water consumption 42
- Politics and government 36
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Rights
- In Copyright 237
Repository
- Oregon State University. Libraries 237
Decade
- 1980-1989 237