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- Water-supply 53
- Politics and government 38
- Irrigation 25
- Laylin, John G. (John Gallup), 1902- 20
- Agriculture 13
- Dams 10
- Treaties 9
- Canals 7
- Water diversion 7
- Building 5
- Negotiation 5
- Amini, Ali 4
- Hydrology 3
- Rivers 3
- Armed Forces 2
- Economics 2
- Groundwater 2
- Political parties 2
- Qanats 2
- Technology 2