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- Water-supply 41
- Politics and government 36
- Laylin, John G. (John Gallup), 1902- 20
- Irrigation 14
- Dams 9
- Canals 8
- Agriculture 7
- Treaties 6
- Amini, Ali 3
- Qanats 2
- Yarmuk River 2
- Airlines 1
- Buffer states 1
- Building 1
- Calendars 1
- Conservation 1
- Desertification 1
- Diyala River (Iran and Iraq) 1
- Freedom of the seas 1
- Hari Rud 1