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Topic
- Irrigation 40
- Agriculture 15
- Watersheds 7
- Agricultural exhibitions 6
- Signs and signboards 6
- Groundwater 5
- Hydrology 5
- Beans 4
- Politics and government 4
- Economics 3
- King Abdullah Canal (Jordan) 3
- Universities and colleges--Faculty 3
- Water-power 3
- Boersma, L. 2
- Building 2
- Bureaucracy 2
- Climate 2
- Crop and Soil Science 2
- Dams 2
- Drainage 2
