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Creator
- Kolars, John F. 18
- Abu Bakr, Yahya 1
- Mitchell, William A. 1
Topic
- Politics and government 8
- Agriculture 7
- Hydrology 7
- Irrigation 6
- Watersheds 5
- Groundwater 4
- Climate 3
- Dams 3
- Demography 3
- Pipelines 3
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Language
- English 18