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Topic
- Water-supply 57
- Politics and government 34
- Irrigation 24
- Laylin, John G. (John Gallup), 1902- 18
- Agriculture 11
- Dams 10
- Treaties 8
- Canals 7
- Water diversion 7
- Building 5
- Negotiation 5
- Amini, Ali 4
- Natural resources--Co-management 4
- Rivers 3
- Qanats 2
- Buffer states 1
- Calendars 1
- Dashti Margo (Afghanistan) 1
- Desertification 1
- Economic development 1
