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Topic
- Watersheds 80
- Groundwater 33
- Agriculture 26
- Irrigation 24
- Soils 22
- Precipitation (Meteorology) 19
- Water quality 16
- Hydrology 15
- Aquifers 13
- Climate 10
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Language
- English 80
Publisher
- Food and Agriculture Organization of the United Nations 22
- United Nations 5
- Pergamon Press (Oxford, England) 4
- United Nations Development Programme 4
- United States. Government Printing Office 4
- Natural resources/water series 3
- Orta Doğu Teknik Üniversitesi (Ankara, Turkey) 3
- Unesco 3
- Academic Press 2
- International Association of Hydrological Sciences 2
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Decade
- 1970-1979 80